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Diffstat (limited to 'sys/nfsclient/nfs_vnops.c')
| -rw-r--r-- | sys/nfsclient/nfs_vnops.c | 3523 |
1 files changed, 3523 insertions, 0 deletions
diff --git a/sys/nfsclient/nfs_vnops.c b/sys/nfsclient/nfs_vnops.c new file mode 100644 index 0000000..241af51 --- /dev/null +++ b/sys/nfsclient/nfs_vnops.c @@ -0,0 +1,3523 @@ +/*- + * Copyright (c) 1989, 1993 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Rick Macklem at The University of Guelph. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)nfs_vnops.c 8.16 (Berkeley) 5/27/95 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +/* + * vnode op calls for Sun NFS version 2 and 3 + */ + +#include "opt_inet.h" +#include "opt_kdtrace.h" + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/systm.h> +#include <sys/resourcevar.h> +#include <sys/proc.h> +#include <sys/mount.h> +#include <sys/bio.h> +#include <sys/buf.h> +#include <sys/jail.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/namei.h> +#include <sys/socket.h> +#include <sys/vnode.h> +#include <sys/dirent.h> +#include <sys/fcntl.h> +#include <sys/lockf.h> +#include <sys/stat.h> +#include <sys/sysctl.h> +#include <sys/signalvar.h> + +#include <vm/vm.h> +#include <vm/vm_extern.h> +#include <vm/vm_object.h> + +#include <fs/fifofs/fifo.h> + +#include <nfs/nfsproto.h> +#include <nfsclient/nfs.h> +#include <nfsclient/nfsnode.h> +#include <nfsclient/nfsmount.h> +#include <nfs/nfs_kdtrace.h> +#include <nfs/nfs_lock.h> +#include <nfs/xdr_subs.h> +#include <nfsclient/nfsm_subs.h> + +#include <net/if.h> +#include <netinet/in.h> +#include <netinet/in_var.h> + +#include <machine/stdarg.h> + +#ifdef KDTRACE_HOOKS +#include <sys/dtrace_bsd.h> + +dtrace_nfsclient_accesscache_flush_probe_func_t + dtrace_nfsclient_accesscache_flush_done_probe; +uint32_t nfsclient_accesscache_flush_done_id; + +dtrace_nfsclient_accesscache_get_probe_func_t + dtrace_nfsclient_accesscache_get_hit_probe, + dtrace_nfsclient_accesscache_get_miss_probe; +uint32_t nfsclient_accesscache_get_hit_id; +uint32_t nfsclient_accesscache_get_miss_id; + +dtrace_nfsclient_accesscache_load_probe_func_t + dtrace_nfsclient_accesscache_load_done_probe; +uint32_t nfsclient_accesscache_load_done_id; +#endif /* !KDTRACE_HOOKS */ + +/* Defs */ +#define TRUE 1 +#define FALSE 0 + +/* + * Ifdef for FreeBSD-current merged buffer cache. It is unfortunate that these + * calls are not in getblk() and brelse() so that they would not be necessary + * here. + */ +#ifndef B_VMIO +#define vfs_busy_pages(bp, f) +#endif + +static vop_read_t nfsfifo_read; +static vop_write_t nfsfifo_write; +static vop_close_t nfsfifo_close; +static int nfs_flush(struct vnode *, int, int); +static int nfs_setattrrpc(struct vnode *, struct vattr *, struct ucred *); +static vop_lookup_t nfs_lookup; +static vop_create_t nfs_create; +static vop_mknod_t nfs_mknod; +static vop_open_t nfs_open; +static vop_close_t nfs_close; +static vop_access_t nfs_access; +static vop_getattr_t nfs_getattr; +static vop_setattr_t nfs_setattr; +static vop_read_t nfs_read; +static vop_fsync_t nfs_fsync; +static vop_remove_t nfs_remove; +static vop_link_t nfs_link; +static vop_rename_t nfs_rename; +static vop_mkdir_t nfs_mkdir; +static vop_rmdir_t nfs_rmdir; +static vop_symlink_t nfs_symlink; +static vop_readdir_t nfs_readdir; +static vop_strategy_t nfs_strategy; +static int nfs_lookitup(struct vnode *, const char *, int, + struct ucred *, struct thread *, struct nfsnode **); +static int nfs_sillyrename(struct vnode *, struct vnode *, + struct componentname *); +static vop_access_t nfsspec_access; +static vop_readlink_t nfs_readlink; +static vop_print_t nfs_print; +static vop_advlock_t nfs_advlock; +static vop_advlockasync_t nfs_advlockasync; + +/* + * Global vfs data structures for nfs + */ +struct vop_vector nfs_vnodeops = { + .vop_default = &default_vnodeops, + .vop_access = nfs_access, + .vop_advlock = nfs_advlock, + .vop_advlockasync = nfs_advlockasync, + .vop_close = nfs_close, + .vop_create = nfs_create, + .vop_fsync = nfs_fsync, + .vop_getattr = nfs_getattr, + .vop_getpages = nfs_getpages, + .vop_putpages = nfs_putpages, + .vop_inactive = nfs_inactive, + .vop_link = nfs_link, + .vop_lookup = nfs_lookup, + .vop_mkdir = nfs_mkdir, + .vop_mknod = nfs_mknod, + .vop_open = nfs_open, + .vop_print = nfs_print, + .vop_read = nfs_read, + .vop_readdir = nfs_readdir, + .vop_readlink = nfs_readlink, + .vop_reclaim = nfs_reclaim, + .vop_remove = nfs_remove, + .vop_rename = nfs_rename, + .vop_rmdir = nfs_rmdir, + .vop_setattr = nfs_setattr, + .vop_strategy = nfs_strategy, + .vop_symlink = nfs_symlink, + .vop_write = nfs_write, +}; + +struct vop_vector nfs_fifoops = { + .vop_default = &fifo_specops, + .vop_access = nfsspec_access, + .vop_close = nfsfifo_close, + .vop_fsync = nfs_fsync, + .vop_getattr = nfs_getattr, + .vop_inactive = nfs_inactive, + .vop_print = nfs_print, + .vop_read = nfsfifo_read, + .vop_reclaim = nfs_reclaim, + .vop_setattr = nfs_setattr, + .vop_write = nfsfifo_write, +}; + +static int nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, + struct componentname *cnp, struct vattr *vap); +static int nfs_removerpc(struct vnode *dvp, const char *name, int namelen, + struct ucred *cred, struct thread *td); +static int nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, + int fnamelen, struct vnode *tdvp, + const char *tnameptr, int tnamelen, + struct ucred *cred, struct thread *td); +static int nfs_renameit(struct vnode *sdvp, struct componentname *scnp, + struct sillyrename *sp); + +/* + * Global variables + */ +struct mtx nfs_iod_mtx; +enum nfsiod_state nfs_iodwant[NFS_MAXASYNCDAEMON]; +struct nfsmount *nfs_iodmount[NFS_MAXASYNCDAEMON]; +int nfs_numasync = 0; +#define DIRHDSIZ (sizeof (struct dirent) - (MAXNAMLEN + 1)) + +SYSCTL_DECL(_vfs_oldnfs); + +static int nfsaccess_cache_timeout = NFS_MAXATTRTIMO; +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_timeout, CTLFLAG_RW, + &nfsaccess_cache_timeout, 0, "NFS ACCESS cache timeout"); + +static int nfs_prime_access_cache = 0; +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, prime_access_cache, CTLFLAG_RW, + &nfs_prime_access_cache, 0, + "Prime NFS ACCESS cache when fetching attributes"); + +static int nfsv3_commit_on_close = 0; +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfsv3_commit_on_close, CTLFLAG_RW, + &nfsv3_commit_on_close, 0, "write+commit on close, else only write"); + +static int nfs_clean_pages_on_close = 1; +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, clean_pages_on_close, CTLFLAG_RW, + &nfs_clean_pages_on_close, 0, "NFS clean dirty pages on close"); + +int nfs_directio_enable = 0; +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_directio_enable, CTLFLAG_RW, + &nfs_directio_enable, 0, "Enable NFS directio"); + +/* + * This sysctl allows other processes to mmap a file that has been opened + * O_DIRECT by a process. In general, having processes mmap the file while + * Direct IO is in progress can lead to Data Inconsistencies. But, we allow + * this by default to prevent DoS attacks - to prevent a malicious user from + * opening up files O_DIRECT preventing other users from mmap'ing these + * files. "Protected" environments where stricter consistency guarantees are + * required can disable this knob. The process that opened the file O_DIRECT + * cannot mmap() the file, because mmap'ed IO on an O_DIRECT open() is not + * meaningful. + */ +int nfs_directio_allow_mmap = 1; +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, nfs_directio_allow_mmap, CTLFLAG_RW, + &nfs_directio_allow_mmap, 0, "Enable mmaped IO on file with O_DIRECT opens"); + +#if 0 +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_hits, CTLFLAG_RD, + &nfsstats.accesscache_hits, 0, "NFS ACCESS cache hit count"); + +SYSCTL_INT(_vfs_oldnfs, OID_AUTO, access_cache_misses, CTLFLAG_RD, + &nfsstats.accesscache_misses, 0, "NFS ACCESS cache miss count"); +#endif + +#define NFSV3ACCESS_ALL (NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY \ + | NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE \ + | NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP) + +/* + * SMP Locking Note : + * The list of locks after the description of the lock is the ordering + * of other locks acquired with the lock held. + * np->n_mtx : Protects the fields in the nfsnode. + VM Object Lock + VI_MTX (acquired indirectly) + * nmp->nm_mtx : Protects the fields in the nfsmount. + rep->r_mtx + * nfs_iod_mtx : Global lock, protects shared nfsiod state. + * nfs_reqq_mtx : Global lock, protects the nfs_reqq list. + nmp->nm_mtx + rep->r_mtx + * rep->r_mtx : Protects the fields in an nfsreq. + */ + +static int +nfs3_access_otw(struct vnode *vp, int wmode, struct thread *td, + struct ucred *cred, uint32_t *retmode) +{ + const int v3 = 1; + u_int32_t *tl; + int error = 0, attrflag, i, lrupos; + + struct mbuf *mreq, *mrep, *md, *mb; + caddr_t bpos, dpos; + u_int32_t rmode; + struct nfsnode *np = VTONFS(vp); + + nfsstats.rpccnt[NFSPROC_ACCESS]++; + mreq = nfsm_reqhead(vp, NFSPROC_ACCESS, NFSX_FH(v3) + NFSX_UNSIGNED); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, v3); + tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); + *tl = txdr_unsigned(wmode); + nfsm_request(vp, NFSPROC_ACCESS, td, cred); + nfsm_postop_attr(vp, attrflag); + if (!error) { + lrupos = 0; + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + rmode = fxdr_unsigned(u_int32_t, *tl); + mtx_lock(&np->n_mtx); + for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { + if (np->n_accesscache[i].uid == cred->cr_uid) { + np->n_accesscache[i].mode = rmode; + np->n_accesscache[i].stamp = time_second; + break; + } + if (i > 0 && np->n_accesscache[i].stamp < + np->n_accesscache[lrupos].stamp) + lrupos = i; + } + if (i == NFS_ACCESSCACHESIZE) { + np->n_accesscache[lrupos].uid = cred->cr_uid; + np->n_accesscache[lrupos].mode = rmode; + np->n_accesscache[lrupos].stamp = time_second; + } + mtx_unlock(&np->n_mtx); + if (retmode != NULL) + *retmode = rmode; + KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, rmode, 0); + } + m_freem(mrep); +nfsmout: +#ifdef KDTRACE_HOOKS + if (error) { + KDTRACE_NFS_ACCESSCACHE_LOAD_DONE(vp, cred->cr_uid, 0, + error); + } +#endif + return (error); +} + +/* + * nfs access vnode op. + * For nfs version 2, just return ok. File accesses may fail later. + * For nfs version 3, use the access rpc to check accessibility. If file modes + * are changed on the server, accesses might still fail later. + */ +static int +nfs_access(struct vop_access_args *ap) +{ + struct vnode *vp = ap->a_vp; + int error = 0, i, gotahit; + u_int32_t mode, rmode, wmode; + int v3 = NFS_ISV3(vp); + struct nfsnode *np = VTONFS(vp); + + /* + * Disallow write attempts on filesystems mounted read-only; + * unless the file is a socket, fifo, or a block or character + * device resident on the filesystem. + */ + if ((ap->a_accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { + switch (vp->v_type) { + case VREG: + case VDIR: + case VLNK: + return (EROFS); + default: + break; + } + } + /* + * For nfs v3, check to see if we have done this recently, and if + * so return our cached result instead of making an ACCESS call. + * If not, do an access rpc, otherwise you are stuck emulating + * ufs_access() locally using the vattr. This may not be correct, + * since the server may apply other access criteria such as + * client uid-->server uid mapping that we do not know about. + */ + if (v3) { + if (ap->a_accmode & VREAD) + mode = NFSV3ACCESS_READ; + else + mode = 0; + if (vp->v_type != VDIR) { + if (ap->a_accmode & VWRITE) + mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND); + if (ap->a_accmode & VEXEC) + mode |= NFSV3ACCESS_EXECUTE; + } else { + if (ap->a_accmode & VWRITE) + mode |= (NFSV3ACCESS_MODIFY | NFSV3ACCESS_EXTEND | + NFSV3ACCESS_DELETE); + if (ap->a_accmode & VEXEC) + mode |= NFSV3ACCESS_LOOKUP; + } + /* XXX safety belt, only make blanket request if caching */ + if (nfsaccess_cache_timeout > 0) { + wmode = NFSV3ACCESS_READ | NFSV3ACCESS_MODIFY | + NFSV3ACCESS_EXTEND | NFSV3ACCESS_EXECUTE | + NFSV3ACCESS_DELETE | NFSV3ACCESS_LOOKUP; + } else { + wmode = mode; + } + + /* + * Does our cached result allow us to give a definite yes to + * this request? + */ + gotahit = 0; + mtx_lock(&np->n_mtx); + for (i = 0; i < NFS_ACCESSCACHESIZE; i++) { + if (ap->a_cred->cr_uid == np->n_accesscache[i].uid) { + if (time_second < (np->n_accesscache[i].stamp + + nfsaccess_cache_timeout) && + (np->n_accesscache[i].mode & mode) == mode) { + nfsstats.accesscache_hits++; + gotahit = 1; + } + break; + } + } + mtx_unlock(&np->n_mtx); +#ifdef KDTRACE_HOOKS + if (gotahit) + KDTRACE_NFS_ACCESSCACHE_GET_HIT(vp, + ap->a_cred->cr_uid, mode); + else + KDTRACE_NFS_ACCESSCACHE_GET_MISS(vp, + ap->a_cred->cr_uid, mode); +#endif + if (gotahit == 0) { + /* + * Either a no, or a don't know. Go to the wire. + */ + nfsstats.accesscache_misses++; + error = nfs3_access_otw(vp, wmode, ap->a_td, ap->a_cred, + &rmode); + if (!error) { + if ((rmode & mode) != mode) + error = EACCES; + } + } + return (error); + } else { + if ((error = nfsspec_access(ap)) != 0) { + return (error); + } + /* + * Attempt to prevent a mapped root from accessing a file + * which it shouldn't. We try to read a byte from the file + * if the user is root and the file is not zero length. + * After calling nfsspec_access, we should have the correct + * file size cached. + */ + mtx_lock(&np->n_mtx); + if (ap->a_cred->cr_uid == 0 && (ap->a_accmode & VREAD) + && VTONFS(vp)->n_size > 0) { + struct iovec aiov; + struct uio auio; + char buf[1]; + + mtx_unlock(&np->n_mtx); + aiov.iov_base = buf; + aiov.iov_len = 1; + auio.uio_iov = &aiov; + auio.uio_iovcnt = 1; + auio.uio_offset = 0; + auio.uio_resid = 1; + auio.uio_segflg = UIO_SYSSPACE; + auio.uio_rw = UIO_READ; + auio.uio_td = ap->a_td; + + if (vp->v_type == VREG) + error = nfs_readrpc(vp, &auio, ap->a_cred); + else if (vp->v_type == VDIR) { + char* bp; + bp = malloc(NFS_DIRBLKSIZ, M_TEMP, M_WAITOK); + aiov.iov_base = bp; + aiov.iov_len = auio.uio_resid = NFS_DIRBLKSIZ; + error = nfs_readdirrpc(vp, &auio, ap->a_cred); + free(bp, M_TEMP); + } else if (vp->v_type == VLNK) + error = nfs_readlinkrpc(vp, &auio, ap->a_cred); + else + error = EACCES; + } else + mtx_unlock(&np->n_mtx); + return (error); + } +} + +int nfs_otw_getattr_avoid = 0; + +/* + * nfs open vnode op + * Check to see if the type is ok + * and that deletion is not in progress. + * For paged in text files, you will need to flush the page cache + * if consistency is lost. + */ +/* ARGSUSED */ +static int +nfs_open(struct vop_open_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct nfsnode *np = VTONFS(vp); + struct vattr vattr; + int error; + int fmode = ap->a_mode; + + if (vp->v_type != VREG && vp->v_type != VDIR && vp->v_type != VLNK) + return (EOPNOTSUPP); + + /* + * Get a valid lease. If cached data is stale, flush it. + */ + mtx_lock(&np->n_mtx); + if (np->n_flag & NMODIFIED) { + mtx_unlock(&np->n_mtx); + error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); + if (error == EINTR || error == EIO) + return (error); + mtx_lock(&np->n_mtx); + np->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); + if (vp->v_type == VDIR) + np->n_direofoffset = 0; + mtx_unlock(&np->n_mtx); + error = VOP_GETATTR(vp, &vattr, ap->a_cred); + if (error) + return (error); + mtx_lock(&np->n_mtx); + np->n_mtime = vattr.va_mtime; + } else { + mtx_unlock(&np->n_mtx); + error = VOP_GETATTR(vp, &vattr, ap->a_cred); + if (error) + return (error); + mtx_lock(&np->n_mtx); + if (NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { + if (vp->v_type == VDIR) + np->n_direofoffset = 0; + mtx_unlock(&np->n_mtx); + error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); + if (error == EINTR || error == EIO) { + return (error); + } + mtx_lock(&np->n_mtx); + np->n_mtime = vattr.va_mtime; + } + } + /* + * If the object has >= 1 O_DIRECT active opens, we disable caching. + */ + if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { + if (np->n_directio_opens == 0) { + mtx_unlock(&np->n_mtx); + error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); + if (error) + return (error); + mtx_lock(&np->n_mtx); + np->n_flag |= NNONCACHE; + } + np->n_directio_opens++; + } + mtx_unlock(&np->n_mtx); + vnode_create_vobject(vp, vattr.va_size, ap->a_td); + return (0); +} + +/* + * nfs close vnode op + * What an NFS client should do upon close after writing is a debatable issue. + * Most NFS clients push delayed writes to the server upon close, basically for + * two reasons: + * 1 - So that any write errors may be reported back to the client process + * doing the close system call. By far the two most likely errors are + * NFSERR_NOSPC and NFSERR_DQUOT to indicate space allocation failure. + * 2 - To put a worst case upper bound on cache inconsistency between + * multiple clients for the file. + * There is also a consistency problem for Version 2 of the protocol w.r.t. + * not being able to tell if other clients are writing a file concurrently, + * since there is no way of knowing if the changed modify time in the reply + * is only due to the write for this client. + * (NFS Version 3 provides weak cache consistency data in the reply that + * should be sufficient to detect and handle this case.) + * + * The current code does the following: + * for NFS Version 2 - play it safe and flush/invalidate all dirty buffers + * for NFS Version 3 - flush dirty buffers to the server but don't invalidate + * or commit them (this satisfies 1 and 2 except for the + * case where the server crashes after this close but + * before the commit RPC, which is felt to be "good + * enough". Changing the last argument to nfs_flush() to + * a 1 would force a commit operation, if it is felt a + * commit is necessary now. + */ +/* ARGSUSED */ +static int +nfs_close(struct vop_close_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct nfsnode *np = VTONFS(vp); + int error = 0; + int fmode = ap->a_fflag; + + if (vp->v_type == VREG) { + /* + * Examine and clean dirty pages, regardless of NMODIFIED. + * This closes a major hole in close-to-open consistency. + * We want to push out all dirty pages (and buffers) on + * close, regardless of whether they were dirtied by + * mmap'ed writes or via write(). + */ + if (nfs_clean_pages_on_close && vp->v_object) { + VM_OBJECT_LOCK(vp->v_object); + vm_object_page_clean(vp->v_object, 0, 0, 0); + VM_OBJECT_UNLOCK(vp->v_object); + } + mtx_lock(&np->n_mtx); + if (np->n_flag & NMODIFIED) { + mtx_unlock(&np->n_mtx); + if (NFS_ISV3(vp)) { + /* + * Under NFSv3 we have dirty buffers to dispose of. We + * must flush them to the NFS server. We have the option + * of waiting all the way through the commit rpc or just + * waiting for the initial write. The default is to only + * wait through the initial write so the data is in the + * server's cache, which is roughly similar to the state + * a standard disk subsystem leaves the file in on close(). + * + * We cannot clear the NMODIFIED bit in np->n_flag due to + * potential races with other processes, and certainly + * cannot clear it if we don't commit. + */ + int cm = nfsv3_commit_on_close ? 1 : 0; + error = nfs_flush(vp, MNT_WAIT, cm); + /* np->n_flag &= ~NMODIFIED; */ + } else + error = nfs_vinvalbuf(vp, V_SAVE, ap->a_td, 1); + mtx_lock(&np->n_mtx); + } + if (np->n_flag & NWRITEERR) { + np->n_flag &= ~NWRITEERR; + error = np->n_error; + } + mtx_unlock(&np->n_mtx); + } + if (nfs_directio_enable) + KASSERT((np->n_directio_asyncwr == 0), + ("nfs_close: dirty unflushed (%d) directio buffers\n", + np->n_directio_asyncwr)); + if (nfs_directio_enable && (fmode & O_DIRECT) && (vp->v_type == VREG)) { + mtx_lock(&np->n_mtx); + KASSERT((np->n_directio_opens > 0), + ("nfs_close: unexpectedly value (0) of n_directio_opens\n")); + np->n_directio_opens--; + if (np->n_directio_opens == 0) + np->n_flag &= ~NNONCACHE; + mtx_unlock(&np->n_mtx); + } + return (error); +} + +/* + * nfs getattr call from vfs. + */ +static int +nfs_getattr(struct vop_getattr_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct nfsnode *np = VTONFS(vp); + struct thread *td = curthread; + struct vattr *vap = ap->a_vap; + struct vattr vattr; + caddr_t bpos, dpos; + int error = 0; + struct mbuf *mreq, *mrep, *md, *mb; + int v3 = NFS_ISV3(vp); + + /* + * Update local times for special files. + */ + mtx_lock(&np->n_mtx); + if (np->n_flag & (NACC | NUPD)) + np->n_flag |= NCHG; + mtx_unlock(&np->n_mtx); + /* + * First look in the cache. + */ + if (nfs_getattrcache(vp, &vattr) == 0) + goto nfsmout; + if (v3 && nfs_prime_access_cache && nfsaccess_cache_timeout > 0) { + nfsstats.accesscache_misses++; + nfs3_access_otw(vp, NFSV3ACCESS_ALL, td, ap->a_cred, NULL); + if (nfs_getattrcache(vp, &vattr) == 0) + goto nfsmout; + } + nfsstats.rpccnt[NFSPROC_GETATTR]++; + mreq = nfsm_reqhead(vp, NFSPROC_GETATTR, NFSX_FH(v3)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, v3); + nfsm_request(vp, NFSPROC_GETATTR, td, ap->a_cred); + if (!error) { + nfsm_loadattr(vp, &vattr); + } + m_freem(mrep); +nfsmout: + vap->va_type = vattr.va_type; + vap->va_mode = vattr.va_mode; + vap->va_nlink = vattr.va_nlink; + vap->va_uid = vattr.va_uid; + vap->va_gid = vattr.va_gid; + vap->va_fsid = vattr.va_fsid; + vap->va_fileid = vattr.va_fileid; + vap->va_size = vattr.va_size; + vap->va_blocksize = vattr.va_blocksize; + vap->va_atime = vattr.va_atime; + vap->va_mtime = vattr.va_mtime; + vap->va_ctime = vattr.va_ctime; + vap->va_gen = vattr.va_gen; + vap->va_flags = vattr.va_flags; + vap->va_rdev = vattr.va_rdev; + vap->va_bytes = vattr.va_bytes; + vap->va_filerev = vattr.va_filerev; + + return (error); +} + +/* + * nfs setattr call. + */ +static int +nfs_setattr(struct vop_setattr_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct nfsnode *np = VTONFS(vp); + struct vattr *vap = ap->a_vap; + struct thread *td = curthread; + int error = 0; + u_quad_t tsize; + +#ifndef nolint + tsize = (u_quad_t)0; +#endif + + /* + * Setting of flags is not supported. + */ + if (vap->va_flags != VNOVAL) + return (EOPNOTSUPP); + + /* + * Disallow write attempts if the filesystem is mounted read-only. + */ + if ((vap->va_flags != VNOVAL || vap->va_uid != (uid_t)VNOVAL || + vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL || + vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL) && + (vp->v_mount->mnt_flag & MNT_RDONLY)) { + error = EROFS; + goto out; + } + if (vap->va_size != VNOVAL) { + switch (vp->v_type) { + case VDIR: + return (EISDIR); + case VCHR: + case VBLK: + case VSOCK: + case VFIFO: + if (vap->va_mtime.tv_sec == VNOVAL && + vap->va_atime.tv_sec == VNOVAL && + vap->va_mode == (mode_t)VNOVAL && + vap->va_uid == (uid_t)VNOVAL && + vap->va_gid == (gid_t)VNOVAL) + return (0); + vap->va_size = VNOVAL; + break; + default: + /* + * Disallow write attempts if the filesystem is + * mounted read-only. + */ + if (vp->v_mount->mnt_flag & MNT_RDONLY) + return (EROFS); + /* + * We run vnode_pager_setsize() early (why?), + * we must set np->n_size now to avoid vinvalbuf + * V_SAVE races that might setsize a lower + * value. + */ + mtx_lock(&np->n_mtx); + tsize = np->n_size; + mtx_unlock(&np->n_mtx); + error = nfs_meta_setsize(vp, ap->a_cred, td, + vap->va_size); + mtx_lock(&np->n_mtx); + if (np->n_flag & NMODIFIED) { + tsize = np->n_size; + mtx_unlock(&np->n_mtx); + if (vap->va_size == 0) + error = nfs_vinvalbuf(vp, 0, td, 1); + else + error = nfs_vinvalbuf(vp, V_SAVE, td, 1); + if (error) { + vnode_pager_setsize(vp, tsize); + goto out; + } + } else + mtx_unlock(&np->n_mtx); + /* + * np->n_size has already been set to vap->va_size + * in nfs_meta_setsize(). We must set it again since + * nfs_loadattrcache() could be called through + * nfs_meta_setsize() and could modify np->n_size. + */ + mtx_lock(&np->n_mtx); + np->n_vattr.va_size = np->n_size = vap->va_size; + mtx_unlock(&np->n_mtx); + }; + } else { + mtx_lock(&np->n_mtx); + if ((vap->va_mtime.tv_sec != VNOVAL || vap->va_atime.tv_sec != VNOVAL) && + (np->n_flag & NMODIFIED) && vp->v_type == VREG) { + mtx_unlock(&np->n_mtx); + if ((error = nfs_vinvalbuf(vp, V_SAVE, td, 1)) != 0 && + (error == EINTR || error == EIO)) + return error; + } else + mtx_unlock(&np->n_mtx); + } + error = nfs_setattrrpc(vp, vap, ap->a_cred); + if (error && vap->va_size != VNOVAL) { + mtx_lock(&np->n_mtx); + np->n_size = np->n_vattr.va_size = tsize; + vnode_pager_setsize(vp, tsize); + mtx_unlock(&np->n_mtx); + } +out: + return (error); +} + +/* + * Do an nfs setattr rpc. + */ +static int +nfs_setattrrpc(struct vnode *vp, struct vattr *vap, struct ucred *cred) +{ + struct nfsv2_sattr *sp; + struct nfsnode *np = VTONFS(vp); + caddr_t bpos, dpos; + u_int32_t *tl; + int error = 0, i, wccflag = NFSV3_WCCRATTR; + struct mbuf *mreq, *mrep, *md, *mb; + int v3 = NFS_ISV3(vp); + + nfsstats.rpccnt[NFSPROC_SETATTR]++; + mreq = nfsm_reqhead(vp, NFSPROC_SETATTR, NFSX_FH(v3) + NFSX_SATTR(v3)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, v3); + if (v3) { + nfsm_v3attrbuild(vap, TRUE); + tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); + *tl = nfs_false; + } else { + sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); + if (vap->va_mode == (mode_t)VNOVAL) + sp->sa_mode = nfs_xdrneg1; + else + sp->sa_mode = vtonfsv2_mode(vp->v_type, vap->va_mode); + if (vap->va_uid == (uid_t)VNOVAL) + sp->sa_uid = nfs_xdrneg1; + else + sp->sa_uid = txdr_unsigned(vap->va_uid); + if (vap->va_gid == (gid_t)VNOVAL) + sp->sa_gid = nfs_xdrneg1; + else + sp->sa_gid = txdr_unsigned(vap->va_gid); + sp->sa_size = txdr_unsigned(vap->va_size); + txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); + txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); + } + nfsm_request(vp, NFSPROC_SETATTR, curthread, cred); + if (v3) { + mtx_lock(&np->n_mtx); + for (i = 0; i < NFS_ACCESSCACHESIZE; i++) + np->n_accesscache[i].stamp = 0; + mtx_unlock(&np->n_mtx); + KDTRACE_NFS_ACCESSCACHE_FLUSH_DONE(vp); + nfsm_wcc_data(vp, wccflag); + } else + nfsm_loadattr(vp, NULL); + m_freem(mrep); +nfsmout: + return (error); +} + +/* + * nfs lookup call, one step at a time... + * First look in cache + * If not found, unlock the directory nfsnode and do the rpc + */ +static int +nfs_lookup(struct vop_lookup_args *ap) +{ + struct componentname *cnp = ap->a_cnp; + struct vnode *dvp = ap->a_dvp; + struct vnode **vpp = ap->a_vpp; + struct mount *mp = dvp->v_mount; + struct vattr vattr; + struct timespec nctime; + int flags = cnp->cn_flags; + struct vnode *newvp; + struct nfsmount *nmp; + caddr_t bpos, dpos; + struct mbuf *mreq, *mrep, *md, *mb; + long len; + nfsfh_t *fhp; + struct nfsnode *np, *newnp; + int error = 0, attrflag, dattrflag, fhsize, ltype, ncticks; + int v3 = NFS_ISV3(dvp); + struct thread *td = cnp->cn_thread; + + *vpp = NULLVP; + if ((flags & ISLASTCN) && (mp->mnt_flag & MNT_RDONLY) && + (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)) + return (EROFS); + if (dvp->v_type != VDIR) + return (ENOTDIR); + nmp = VFSTONFS(mp); + np = VTONFS(dvp); + if ((error = VOP_ACCESS(dvp, VEXEC, cnp->cn_cred, td)) != 0) { + *vpp = NULLVP; + return (error); + } + error = cache_lookup(dvp, vpp, cnp, &nctime, &ncticks); + if (error > 0 && error != ENOENT) + return (error); + if (error == -1) { + /* + * Lookups of "." are special and always return the + * current directory. cache_lookup() already handles + * associated locking bookkeeping, etc. + */ + if (cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.') { + /* XXX: Is this really correct? */ + if (cnp->cn_nameiop != LOOKUP && + (flags & ISLASTCN)) + cnp->cn_flags |= SAVENAME; + return (0); + } + + /* + * We only accept a positive hit in the cache if the + * change time of the file matches our cached copy. + * Otherwise, we discard the cache entry and fallback + * to doing a lookup RPC. We also only trust cache + * entries for less than nm_nametimeo seconds. + * + * To better handle stale file handles and attributes, + * clear the attribute cache of this node if it is a + * leaf component, part of an open() call, and not + * locally modified before fetching the attributes. + * This should allow stale file handles to be detected + * here where we can fall back to a LOOKUP RPC to + * recover rather than having nfs_open() detect the + * stale file handle and failing open(2) with ESTALE. + */ + newvp = *vpp; + newnp = VTONFS(newvp); + if (!(nmp->nm_flag & NFSMNT_NOCTO) && + (flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && + !(newnp->n_flag & NMODIFIED)) { + mtx_lock(&newnp->n_mtx); + newnp->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); + mtx_unlock(&newnp->n_mtx); + } + if ((u_int)(ticks - ncticks) < (nmp->nm_nametimeo * hz) && + VOP_GETATTR(newvp, &vattr, cnp->cn_cred) == 0 && + timespeccmp(&vattr.va_ctime, &nctime, ==)) { + nfsstats.lookupcache_hits++; + if (cnp->cn_nameiop != LOOKUP && + (flags & ISLASTCN)) + cnp->cn_flags |= SAVENAME; + return (0); + } + cache_purge(newvp); + if (dvp != newvp) + vput(newvp); + else + vrele(newvp); + *vpp = NULLVP; + } else if (error == ENOENT) { + if (dvp->v_iflag & VI_DOOMED) + return (ENOENT); + /* + * We only accept a negative hit in the cache if the + * modification time of the parent directory matches + * the cached copy in the name cache entry. + * Otherwise, we discard all of the negative cache + * entries for this directory. We also only trust + * negative cache entries for up to nm_negnametimeo + * seconds. + */ + if ((u_int)(ticks - ncticks) < (nmp->nm_negnametimeo * hz) && + VOP_GETATTR(dvp, &vattr, cnp->cn_cred) == 0 && + timespeccmp(&vattr.va_mtime, &nctime, ==)) { + nfsstats.lookupcache_hits++; + return (ENOENT); + } + cache_purge_negative(dvp); + } + + attrflag = dattrflag = 0; + error = 0; + newvp = NULLVP; + nfsstats.lookupcache_misses++; + nfsstats.rpccnt[NFSPROC_LOOKUP]++; + len = cnp->cn_namelen; + mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, + NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(dvp, v3); + nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); + nfsm_request(dvp, NFSPROC_LOOKUP, cnp->cn_thread, cnp->cn_cred); + if (error) { + if (v3) { + nfsm_postop_attr_va(dvp, dattrflag, &vattr); + m_freem(mrep); + } + goto nfsmout; + } + nfsm_getfh(fhp, fhsize, v3); + + /* + * Handle RENAME case... + */ + if (cnp->cn_nameiop == RENAME && (flags & ISLASTCN)) { + if (NFS_CMPFH(np, fhp, fhsize)) { + m_freem(mrep); + return (EISDIR); + } + error = nfs_nget(mp, fhp, fhsize, &np, LK_EXCLUSIVE); + if (error) { + m_freem(mrep); + return (error); + } + newvp = NFSTOV(np); + if (v3) { + nfsm_postop_attr(newvp, attrflag); + nfsm_postop_attr(dvp, attrflag); + } else + nfsm_loadattr(newvp, NULL); + *vpp = newvp; + m_freem(mrep); + cnp->cn_flags |= SAVENAME; + return (0); + } + + if (flags & ISDOTDOT) { + ltype = VOP_ISLOCKED(dvp); + error = vfs_busy(mp, MBF_NOWAIT); + if (error != 0) { + vfs_ref(mp); + VOP_UNLOCK(dvp, 0); + error = vfs_busy(mp, 0); + vn_lock(dvp, ltype | LK_RETRY); + vfs_rel(mp); + if (error == 0 && (dvp->v_iflag & VI_DOOMED)) { + vfs_unbusy(mp); + error = ENOENT; + } + if (error != 0) { + m_freem(mrep); + return (error); + } + } + VOP_UNLOCK(dvp, 0); + error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags); + if (error == 0) + newvp = NFSTOV(np); + vfs_unbusy(mp); + if (newvp != dvp) + vn_lock(dvp, ltype | LK_RETRY); + if (dvp->v_iflag & VI_DOOMED) { + if (error == 0) { + if (newvp == dvp) + vrele(newvp); + else + vput(newvp); + } + error = ENOENT; + } + if (error) { + m_freem(mrep); + return (error); + } + } else if (NFS_CMPFH(np, fhp, fhsize)) { + VREF(dvp); + newvp = dvp; + } else { + error = nfs_nget(mp, fhp, fhsize, &np, cnp->cn_lkflags); + if (error) { + m_freem(mrep); + return (error); + } + newvp = NFSTOV(np); + + /* + * Flush the attribute cache when opening a leaf node + * to ensure that fresh attributes are fetched in + * nfs_open() if we are unable to fetch attributes + * from the LOOKUP reply. + */ + if ((flags & (ISLASTCN | ISOPEN)) == (ISLASTCN | ISOPEN) && + !(np->n_flag & NMODIFIED)) { + mtx_lock(&np->n_mtx); + np->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(newvp); + mtx_unlock(&np->n_mtx); + } + } + if (v3) { + nfsm_postop_attr_va(newvp, attrflag, &vattr); + nfsm_postop_attr(dvp, dattrflag); + } else { + nfsm_loadattr(newvp, &vattr); + attrflag = 1; + } + if (cnp->cn_nameiop != LOOKUP && (flags & ISLASTCN)) + cnp->cn_flags |= SAVENAME; + if ((cnp->cn_flags & MAKEENTRY) && + (cnp->cn_nameiop != DELETE || !(flags & ISLASTCN)) && attrflag) { + cache_enter_time(dvp, newvp, cnp, &vattr.va_ctime); + } + *vpp = newvp; + m_freem(mrep); +nfsmout: + if (error) { + if (newvp != NULLVP) { + vput(newvp); + *vpp = NULLVP; + } + + if (error != ENOENT) + goto done; + + /* The requested file was not found. */ + if ((cnp->cn_nameiop == CREATE || cnp->cn_nameiop == RENAME) && + (flags & ISLASTCN)) { + /* + * XXX: UFS does a full VOP_ACCESS(dvp, + * VWRITE) here instead of just checking + * MNT_RDONLY. + */ + if (mp->mnt_flag & MNT_RDONLY) + return (EROFS); + cnp->cn_flags |= SAVENAME; + return (EJUSTRETURN); + } + + if ((cnp->cn_flags & MAKEENTRY) && cnp->cn_nameiop != CREATE && + dattrflag) { + /* + * Cache the modification time of the parent + * directory from the post-op attributes in + * the name cache entry. The negative cache + * entry will be ignored once the directory + * has changed. Don't bother adding the entry + * if the directory has already changed. + */ + mtx_lock(&np->n_mtx); + if (timespeccmp(&np->n_vattr.va_mtime, + &vattr.va_mtime, ==)) { + mtx_unlock(&np->n_mtx); + cache_enter_time(dvp, NULL, cnp, + &vattr.va_mtime); + } else + mtx_unlock(&np->n_mtx); + } + return (ENOENT); + } +done: + return (error); +} + +/* + * nfs read call. + * Just call nfs_bioread() to do the work. + */ +static int +nfs_read(struct vop_read_args *ap) +{ + struct vnode *vp = ap->a_vp; + + switch (vp->v_type) { + case VREG: + return (nfs_bioread(vp, ap->a_uio, ap->a_ioflag, ap->a_cred)); + case VDIR: + return (EISDIR); + default: + return (EOPNOTSUPP); + } +} + +/* + * nfs readlink call + */ +static int +nfs_readlink(struct vop_readlink_args *ap) +{ + struct vnode *vp = ap->a_vp; + + if (vp->v_type != VLNK) + return (EINVAL); + return (nfs_bioread(vp, ap->a_uio, 0, ap->a_cred)); +} + +/* + * Do a readlink rpc. + * Called by nfs_doio() from below the buffer cache. + */ +int +nfs_readlinkrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) +{ + caddr_t bpos, dpos; + int error = 0, len, attrflag; + struct mbuf *mreq, *mrep, *md, *mb; + int v3 = NFS_ISV3(vp); + + nfsstats.rpccnt[NFSPROC_READLINK]++; + mreq = nfsm_reqhead(vp, NFSPROC_READLINK, NFSX_FH(v3)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, v3); + nfsm_request(vp, NFSPROC_READLINK, uiop->uio_td, cred); + if (v3) + nfsm_postop_attr(vp, attrflag); + if (!error) { + nfsm_strsiz(len, NFS_MAXPATHLEN); + if (len == NFS_MAXPATHLEN) { + struct nfsnode *np = VTONFS(vp); + mtx_lock(&np->n_mtx); + if (np->n_size && np->n_size < NFS_MAXPATHLEN) + len = np->n_size; + mtx_unlock(&np->n_mtx); + } + nfsm_mtouio(uiop, len); + } + m_freem(mrep); +nfsmout: + return (error); +} + +/* + * nfs read rpc call + * Ditto above + */ +int +nfs_readrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) +{ + u_int32_t *tl; + caddr_t bpos, dpos; + struct mbuf *mreq, *mrep, *md, *mb; + struct nfsmount *nmp; + off_t end; + int error = 0, len, retlen, tsiz, eof, attrflag; + int v3 = NFS_ISV3(vp); + int rsize; + +#ifndef nolint + eof = 0; +#endif + nmp = VFSTONFS(vp->v_mount); + tsiz = uiop->uio_resid; + mtx_lock(&nmp->nm_mtx); + end = uiop->uio_offset + tsiz; + if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) { + mtx_unlock(&nmp->nm_mtx); + return (EFBIG); + } + rsize = nmp->nm_rsize; + mtx_unlock(&nmp->nm_mtx); + while (tsiz > 0) { + nfsstats.rpccnt[NFSPROC_READ]++; + len = (tsiz > rsize) ? rsize : tsiz; + mreq = nfsm_reqhead(vp, NFSPROC_READ, NFSX_FH(v3) + NFSX_UNSIGNED * 3); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, v3); + tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED * 3); + if (v3) { + txdr_hyper(uiop->uio_offset, tl); + *(tl + 2) = txdr_unsigned(len); + } else { + *tl++ = txdr_unsigned(uiop->uio_offset); + *tl++ = txdr_unsigned(len); + *tl = 0; + } + nfsm_request(vp, NFSPROC_READ, uiop->uio_td, cred); + if (v3) { + nfsm_postop_attr(vp, attrflag); + if (error) { + m_freem(mrep); + goto nfsmout; + } + tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED); + eof = fxdr_unsigned(int, *(tl + 1)); + } else { + nfsm_loadattr(vp, NULL); + } + nfsm_strsiz(retlen, rsize); + nfsm_mtouio(uiop, retlen); + m_freem(mrep); + tsiz -= retlen; + if (v3) { + if (eof || retlen == 0) { + tsiz = 0; + } + } else if (retlen < len) { + tsiz = 0; + } + } +nfsmout: + return (error); +} + +/* + * nfs write call + */ +int +nfs_writerpc(struct vnode *vp, struct uio *uiop, struct ucred *cred, + int *iomode, int *must_commit) +{ + u_int32_t *tl; + int32_t backup; + caddr_t bpos, dpos; + struct mbuf *mreq, *mrep, *md, *mb; + struct nfsmount *nmp = VFSTONFS(vp->v_mount); + off_t end; + int error = 0, len, tsiz, wccflag = NFSV3_WCCRATTR, rlen, commit; + int v3 = NFS_ISV3(vp), committed = NFSV3WRITE_FILESYNC; + int wsize; + + KASSERT(uiop->uio_iovcnt == 1, ("nfs: writerpc iovcnt > 1")); + *must_commit = 0; + tsiz = uiop->uio_resid; + mtx_lock(&nmp->nm_mtx); + end = uiop->uio_offset + tsiz; + if (end > nmp->nm_maxfilesize || end < uiop->uio_offset) { + mtx_unlock(&nmp->nm_mtx); + return (EFBIG); + } + wsize = nmp->nm_wsize; + mtx_unlock(&nmp->nm_mtx); + while (tsiz > 0) { + nfsstats.rpccnt[NFSPROC_WRITE]++; + len = (tsiz > wsize) ? wsize : tsiz; + mreq = nfsm_reqhead(vp, NFSPROC_WRITE, + NFSX_FH(v3) + 5 * NFSX_UNSIGNED + nfsm_rndup(len)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, v3); + if (v3) { + tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); + txdr_hyper(uiop->uio_offset, tl); + tl += 2; + *tl++ = txdr_unsigned(len); + *tl++ = txdr_unsigned(*iomode); + *tl = txdr_unsigned(len); + } else { + u_int32_t x; + + tl = nfsm_build(u_int32_t *, 4 * NFSX_UNSIGNED); + /* Set both "begin" and "current" to non-garbage. */ + x = txdr_unsigned((u_int32_t)uiop->uio_offset); + *tl++ = x; /* "begin offset" */ + *tl++ = x; /* "current offset" */ + x = txdr_unsigned(len); + *tl++ = x; /* total to this offset */ + *tl = x; /* size of this write */ + } + nfsm_uiotom(uiop, len); + nfsm_request(vp, NFSPROC_WRITE, uiop->uio_td, cred); + if (v3) { + wccflag = NFSV3_WCCCHK; + nfsm_wcc_data(vp, wccflag); + if (!error) { + tl = nfsm_dissect(u_int32_t *, 2 * NFSX_UNSIGNED + + NFSX_V3WRITEVERF); + rlen = fxdr_unsigned(int, *tl++); + if (rlen == 0) { + error = NFSERR_IO; + m_freem(mrep); + break; + } else if (rlen < len) { + backup = len - rlen; + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base - + backup; + uiop->uio_iov->iov_len += backup; + uiop->uio_offset -= backup; + uiop->uio_resid += backup; + len = rlen; + } + commit = fxdr_unsigned(int, *tl++); + + /* + * Return the lowest committment level + * obtained by any of the RPCs. + */ + if (committed == NFSV3WRITE_FILESYNC) + committed = commit; + else if (committed == NFSV3WRITE_DATASYNC && + commit == NFSV3WRITE_UNSTABLE) + committed = commit; + mtx_lock(&nmp->nm_mtx); + if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0){ + bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, + NFSX_V3WRITEVERF); + nmp->nm_state |= NFSSTA_HASWRITEVERF; + } else if (bcmp((caddr_t)tl, + (caddr_t)nmp->nm_verf, NFSX_V3WRITEVERF)) { + *must_commit = 1; + bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, + NFSX_V3WRITEVERF); + } + mtx_unlock(&nmp->nm_mtx); + } + } else { + nfsm_loadattr(vp, NULL); + } + if (wccflag) { + mtx_lock(&(VTONFS(vp))->n_mtx); + VTONFS(vp)->n_mtime = VTONFS(vp)->n_vattr.va_mtime; + mtx_unlock(&(VTONFS(vp))->n_mtx); + } + m_freem(mrep); + if (error) + break; + tsiz -= len; + } +nfsmout: + if (DOINGASYNC(vp)) + committed = NFSV3WRITE_FILESYNC; + *iomode = committed; + if (error) + uiop->uio_resid = tsiz; + return (error); +} + +/* + * nfs mknod rpc + * For NFS v2 this is a kludge. Use a create rpc but with the IFMT bits of the + * mode set to specify the file type and the size field for rdev. + */ +static int +nfs_mknodrpc(struct vnode *dvp, struct vnode **vpp, struct componentname *cnp, + struct vattr *vap) +{ + struct nfsv2_sattr *sp; + u_int32_t *tl; + struct vnode *newvp = NULL; + struct nfsnode *np = NULL; + struct vattr vattr; + caddr_t bpos, dpos; + int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0; + struct mbuf *mreq, *mrep, *md, *mb; + u_int32_t rdev; + int v3 = NFS_ISV3(dvp); + + if (vap->va_type == VCHR || vap->va_type == VBLK) + rdev = txdr_unsigned(vap->va_rdev); + else if (vap->va_type == VFIFO || vap->va_type == VSOCK) + rdev = nfs_xdrneg1; + else { + return (EOPNOTSUPP); + } + if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) + return (error); + nfsstats.rpccnt[NFSPROC_MKNOD]++; + mreq = nfsm_reqhead(dvp, NFSPROC_MKNOD, NFSX_FH(v3) + 4 * NFSX_UNSIGNED + + + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(dvp, v3); + nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); + if (v3) { + tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); + *tl++ = vtonfsv3_type(vap->va_type); + nfsm_v3attrbuild(vap, FALSE); + if (vap->va_type == VCHR || vap->va_type == VBLK) { + tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); + *tl++ = txdr_unsigned(major(vap->va_rdev)); + *tl = txdr_unsigned(minor(vap->va_rdev)); + } + } else { + sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); + sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); + sp->sa_uid = nfs_xdrneg1; + sp->sa_gid = nfs_xdrneg1; + sp->sa_size = rdev; + txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); + txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); + } + nfsm_request(dvp, NFSPROC_MKNOD, cnp->cn_thread, cnp->cn_cred); + if (!error) { + nfsm_mtofh(dvp, newvp, v3, gotvp); + if (!gotvp) { + if (newvp) { + vput(newvp); + newvp = NULL; + } + error = nfs_lookitup(dvp, cnp->cn_nameptr, + cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); + if (!error) + newvp = NFSTOV(np); + } + } + if (v3) + nfsm_wcc_data(dvp, wccflag); + m_freem(mrep); +nfsmout: + if (error) { + if (newvp) + vput(newvp); + } else { + *vpp = newvp; + } + mtx_lock(&(VTONFS(dvp))->n_mtx); + VTONFS(dvp)->n_flag |= NMODIFIED; + if (!wccflag) { + VTONFS(dvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); + } + mtx_unlock(&(VTONFS(dvp))->n_mtx); + return (error); +} + +/* + * nfs mknod vop + * just call nfs_mknodrpc() to do the work. + */ +/* ARGSUSED */ +static int +nfs_mknod(struct vop_mknod_args *ap) +{ + return (nfs_mknodrpc(ap->a_dvp, ap->a_vpp, ap->a_cnp, ap->a_vap)); +} + +static u_long create_verf; +/* + * nfs file create call + */ +static int +nfs_create(struct vop_create_args *ap) +{ + struct vnode *dvp = ap->a_dvp; + struct vattr *vap = ap->a_vap; + struct componentname *cnp = ap->a_cnp; + struct nfsv2_sattr *sp; + u_int32_t *tl; + struct nfsnode *np = NULL; + struct vnode *newvp = NULL; + caddr_t bpos, dpos; + int error = 0, wccflag = NFSV3_WCCRATTR, gotvp = 0, fmode = 0; + struct mbuf *mreq, *mrep, *md, *mb; + struct vattr vattr; + int v3 = NFS_ISV3(dvp); + + /* + * Oops, not for me.. + */ + if (vap->va_type == VSOCK) { + error = nfs_mknodrpc(dvp, ap->a_vpp, cnp, vap); + return (error); + } + + if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) { + return (error); + } + if (vap->va_vaflags & VA_EXCLUSIVE) + fmode |= O_EXCL; +again: + nfsstats.rpccnt[NFSPROC_CREATE]++; + mreq = nfsm_reqhead(dvp, NFSPROC_CREATE, NFSX_FH(v3) + 2 * NFSX_UNSIGNED + + nfsm_rndup(cnp->cn_namelen) + NFSX_SATTR(v3)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(dvp, v3); + nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); + if (v3) { + tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED); + if (fmode & O_EXCL) { + *tl = txdr_unsigned(NFSV3CREATE_EXCLUSIVE); + tl = nfsm_build(u_int32_t *, NFSX_V3CREATEVERF); +#ifdef INET + CURVNET_SET(CRED_TO_VNET(cnp->cn_cred)); + IN_IFADDR_RLOCK(); + if (!TAILQ_EMPTY(&V_in_ifaddrhead)) + *tl++ = IA_SIN(TAILQ_FIRST(&V_in_ifaddrhead))->sin_addr.s_addr; + else +#endif + *tl++ = create_verf; +#ifdef INET + IN_IFADDR_RUNLOCK(); + CURVNET_RESTORE(); +#endif + *tl = ++create_verf; + } else { + *tl = txdr_unsigned(NFSV3CREATE_UNCHECKED); + nfsm_v3attrbuild(vap, FALSE); + } + } else { + sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); + sp->sa_mode = vtonfsv2_mode(vap->va_type, vap->va_mode); + sp->sa_uid = nfs_xdrneg1; + sp->sa_gid = nfs_xdrneg1; + sp->sa_size = 0; + txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); + txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); + } + nfsm_request(dvp, NFSPROC_CREATE, cnp->cn_thread, cnp->cn_cred); + if (!error) { + nfsm_mtofh(dvp, newvp, v3, gotvp); + if (!gotvp) { + if (newvp) { + vput(newvp); + newvp = NULL; + } + error = nfs_lookitup(dvp, cnp->cn_nameptr, + cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread, &np); + if (!error) + newvp = NFSTOV(np); + } + } + if (v3) + nfsm_wcc_data(dvp, wccflag); + m_freem(mrep); +nfsmout: + if (error) { + if (v3 && (fmode & O_EXCL) && error == NFSERR_NOTSUPP) { + fmode &= ~O_EXCL; + goto again; + } + if (newvp) + vput(newvp); + } else if (v3 && (fmode & O_EXCL)) { + /* + * We are normally called with only a partially initialized + * VAP. Since the NFSv3 spec says that server may use the + * file attributes to store the verifier, the spec requires + * us to do a SETATTR RPC. FreeBSD servers store the verifier + * in atime, but we can't really assume that all servers will + * so we ensure that our SETATTR sets both atime and mtime. + */ + if (vap->va_mtime.tv_sec == VNOVAL) + vfs_timestamp(&vap->va_mtime); + if (vap->va_atime.tv_sec == VNOVAL) + vap->va_atime = vap->va_mtime; + error = nfs_setattrrpc(newvp, vap, cnp->cn_cred); + if (error) + vput(newvp); + } + if (!error) { + *ap->a_vpp = newvp; + } + mtx_lock(&(VTONFS(dvp))->n_mtx); + VTONFS(dvp)->n_flag |= NMODIFIED; + if (!wccflag) { + VTONFS(dvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); + } + mtx_unlock(&(VTONFS(dvp))->n_mtx); + return (error); +} + +/* + * nfs file remove call + * To try and make nfs semantics closer to ufs semantics, a file that has + * other processes using the vnode is renamed instead of removed and then + * removed later on the last close. + * - If v_usecount > 1 + * If a rename is not already in the works + * call nfs_sillyrename() to set it up + * else + * do the remove rpc + */ +static int +nfs_remove(struct vop_remove_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct vnode *dvp = ap->a_dvp; + struct componentname *cnp = ap->a_cnp; + struct nfsnode *np = VTONFS(vp); + int error = 0; + struct vattr vattr; + + KASSERT((cnp->cn_flags & HASBUF) != 0, ("nfs_remove: no name")); + KASSERT(vrefcnt(vp) > 0, ("nfs_remove: bad v_usecount")); + if (vp->v_type == VDIR) + error = EPERM; + else if (vrefcnt(vp) == 1 || (np->n_sillyrename && + !VOP_GETATTR(vp, &vattr, cnp->cn_cred) && vattr.va_nlink > 1)) { + /* + * Purge the name cache so that the chance of a lookup for + * the name succeeding while the remove is in progress is + * minimized. Without node locking it can still happen, such + * that an I/O op returns ESTALE, but since you get this if + * another host removes the file.. + */ + cache_purge(vp); + /* + * throw away biocache buffers, mainly to avoid + * unnecessary delayed writes later. + */ + error = nfs_vinvalbuf(vp, 0, cnp->cn_thread, 1); + /* Do the rpc */ + if (error != EINTR && error != EIO) + error = nfs_removerpc(dvp, cnp->cn_nameptr, + cnp->cn_namelen, cnp->cn_cred, cnp->cn_thread); + /* + * Kludge City: If the first reply to the remove rpc is lost.. + * the reply to the retransmitted request will be ENOENT + * since the file was in fact removed + * Therefore, we cheat and return success. + */ + if (error == ENOENT) + error = 0; + } else if (!np->n_sillyrename) + error = nfs_sillyrename(dvp, vp, cnp); + mtx_lock(&np->n_mtx); + np->n_attrstamp = 0; + mtx_unlock(&np->n_mtx); + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); + return (error); +} + +/* + * nfs file remove rpc called from nfs_inactive + */ +int +nfs_removeit(struct sillyrename *sp) +{ + /* + * Make sure that the directory vnode is still valid. + * XXX we should lock sp->s_dvp here. + */ + if (sp->s_dvp->v_type == VBAD) + return (0); + return (nfs_removerpc(sp->s_dvp, sp->s_name, sp->s_namlen, sp->s_cred, + NULL)); +} + +/* + * Nfs remove rpc, called from nfs_remove() and nfs_removeit(). + */ +static int +nfs_removerpc(struct vnode *dvp, const char *name, int namelen, + struct ucred *cred, struct thread *td) +{ + caddr_t bpos, dpos; + int error = 0, wccflag = NFSV3_WCCRATTR; + struct mbuf *mreq, *mrep, *md, *mb; + int v3 = NFS_ISV3(dvp); + + nfsstats.rpccnt[NFSPROC_REMOVE]++; + mreq = nfsm_reqhead(dvp, NFSPROC_REMOVE, + NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(namelen)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(dvp, v3); + nfsm_strtom(name, namelen, NFS_MAXNAMLEN); + nfsm_request(dvp, NFSPROC_REMOVE, td, cred); + if (v3) + nfsm_wcc_data(dvp, wccflag); + m_freem(mrep); +nfsmout: + mtx_lock(&(VTONFS(dvp))->n_mtx); + VTONFS(dvp)->n_flag |= NMODIFIED; + if (!wccflag) { + VTONFS(dvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); + } + mtx_unlock(&(VTONFS(dvp))->n_mtx); + return (error); +} + +/* + * nfs file rename call + */ +static int +nfs_rename(struct vop_rename_args *ap) +{ + struct vnode *fvp = ap->a_fvp; + struct vnode *tvp = ap->a_tvp; + struct vnode *fdvp = ap->a_fdvp; + struct vnode *tdvp = ap->a_tdvp; + struct componentname *tcnp = ap->a_tcnp; + struct componentname *fcnp = ap->a_fcnp; + int error; + + KASSERT((tcnp->cn_flags & HASBUF) != 0 && + (fcnp->cn_flags & HASBUF) != 0, ("nfs_rename: no name")); + /* Check for cross-device rename */ + if ((fvp->v_mount != tdvp->v_mount) || + (tvp && (fvp->v_mount != tvp->v_mount))) { + error = EXDEV; + goto out; + } + + if (fvp == tvp) { + nfs_printf("nfs_rename: fvp == tvp (can't happen)\n"); + error = 0; + goto out; + } + if ((error = vn_lock(fvp, LK_EXCLUSIVE)) != 0) + goto out; + + /* + * We have to flush B_DELWRI data prior to renaming + * the file. If we don't, the delayed-write buffers + * can be flushed out later after the file has gone stale + * under NFSV3. NFSV2 does not have this problem because + * ( as far as I can tell ) it flushes dirty buffers more + * often. + * + * Skip the rename operation if the fsync fails, this can happen + * due to the server's volume being full, when we pushed out data + * that was written back to our cache earlier. Not checking for + * this condition can result in potential (silent) data loss. + */ + error = VOP_FSYNC(fvp, MNT_WAIT, fcnp->cn_thread); + VOP_UNLOCK(fvp, 0); + if (!error && tvp) + error = VOP_FSYNC(tvp, MNT_WAIT, tcnp->cn_thread); + if (error) + goto out; + + /* + * If the tvp exists and is in use, sillyrename it before doing the + * rename of the new file over it. + * XXX Can't sillyrename a directory. + */ + if (tvp && vrefcnt(tvp) > 1 && !VTONFS(tvp)->n_sillyrename && + tvp->v_type != VDIR && !nfs_sillyrename(tdvp, tvp, tcnp)) { + vput(tvp); + tvp = NULL; + } + + error = nfs_renamerpc(fdvp, fcnp->cn_nameptr, fcnp->cn_namelen, + tdvp, tcnp->cn_nameptr, tcnp->cn_namelen, tcnp->cn_cred, + tcnp->cn_thread); + + if (fvp->v_type == VDIR) { + if (tvp != NULL && tvp->v_type == VDIR) + cache_purge(tdvp); + cache_purge(fdvp); + } + +out: + if (tdvp == tvp) + vrele(tdvp); + else + vput(tdvp); + if (tvp) + vput(tvp); + vrele(fdvp); + vrele(fvp); + /* + * Kludge: Map ENOENT => 0 assuming that it is a reply to a retry. + */ + if (error == ENOENT) + error = 0; + return (error); +} + +/* + * nfs file rename rpc called from nfs_remove() above + */ +static int +nfs_renameit(struct vnode *sdvp, struct componentname *scnp, + struct sillyrename *sp) +{ + + return (nfs_renamerpc(sdvp, scnp->cn_nameptr, scnp->cn_namelen, sdvp, + sp->s_name, sp->s_namlen, scnp->cn_cred, scnp->cn_thread)); +} + +/* + * Do an nfs rename rpc. Called from nfs_rename() and nfs_renameit(). + */ +static int +nfs_renamerpc(struct vnode *fdvp, const char *fnameptr, int fnamelen, + struct vnode *tdvp, const char *tnameptr, int tnamelen, struct ucred *cred, + struct thread *td) +{ + caddr_t bpos, dpos; + int error = 0, fwccflag = NFSV3_WCCRATTR, twccflag = NFSV3_WCCRATTR; + struct mbuf *mreq, *mrep, *md, *mb; + int v3 = NFS_ISV3(fdvp); + + nfsstats.rpccnt[NFSPROC_RENAME]++; + mreq = nfsm_reqhead(fdvp, NFSPROC_RENAME, + (NFSX_FH(v3) + NFSX_UNSIGNED)*2 + nfsm_rndup(fnamelen) + + nfsm_rndup(tnamelen)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(fdvp, v3); + nfsm_strtom(fnameptr, fnamelen, NFS_MAXNAMLEN); + nfsm_fhtom(tdvp, v3); + nfsm_strtom(tnameptr, tnamelen, NFS_MAXNAMLEN); + nfsm_request(fdvp, NFSPROC_RENAME, td, cred); + if (v3) { + nfsm_wcc_data(fdvp, fwccflag); + nfsm_wcc_data(tdvp, twccflag); + } + m_freem(mrep); +nfsmout: + mtx_lock(&(VTONFS(fdvp))->n_mtx); + VTONFS(fdvp)->n_flag |= NMODIFIED; + mtx_unlock(&(VTONFS(fdvp))->n_mtx); + mtx_lock(&(VTONFS(tdvp))->n_mtx); + VTONFS(tdvp)->n_flag |= NMODIFIED; + mtx_unlock(&(VTONFS(tdvp))->n_mtx); + if (!fwccflag) { + VTONFS(fdvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(fdvp); + } + if (!twccflag) { + VTONFS(tdvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); + } + return (error); +} + +/* + * nfs hard link create call + */ +static int +nfs_link(struct vop_link_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct vnode *tdvp = ap->a_tdvp; + struct componentname *cnp = ap->a_cnp; + caddr_t bpos, dpos; + int error = 0, wccflag = NFSV3_WCCRATTR, attrflag = 0; + struct mbuf *mreq, *mrep, *md, *mb; + int v3; + + if (vp->v_mount != tdvp->v_mount) { + return (EXDEV); + } + + /* + * Push all writes to the server, so that the attribute cache + * doesn't get "out of sync" with the server. + * XXX There should be a better way! + */ + VOP_FSYNC(vp, MNT_WAIT, cnp->cn_thread); + + v3 = NFS_ISV3(vp); + nfsstats.rpccnt[NFSPROC_LINK]++; + mreq = nfsm_reqhead(vp, NFSPROC_LINK, + NFSX_FH(v3)*2 + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, v3); + nfsm_fhtom(tdvp, v3); + nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); + nfsm_request(vp, NFSPROC_LINK, cnp->cn_thread, cnp->cn_cred); + if (v3) { + nfsm_postop_attr(vp, attrflag); + nfsm_wcc_data(tdvp, wccflag); + } + m_freem(mrep); +nfsmout: + mtx_lock(&(VTONFS(tdvp))->n_mtx); + VTONFS(tdvp)->n_flag |= NMODIFIED; + mtx_unlock(&(VTONFS(tdvp))->n_mtx); + if (!attrflag) { + VTONFS(vp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(vp); + } + if (!wccflag) { + VTONFS(tdvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(tdvp); + } + return (error); +} + +/* + * nfs symbolic link create call + */ +static int +nfs_symlink(struct vop_symlink_args *ap) +{ + struct vnode *dvp = ap->a_dvp; + struct vattr *vap = ap->a_vap; + struct componentname *cnp = ap->a_cnp; + struct nfsv2_sattr *sp; + caddr_t bpos, dpos; + int slen, error = 0, wccflag = NFSV3_WCCRATTR, gotvp; + struct mbuf *mreq, *mrep, *md, *mb; + struct vnode *newvp = NULL; + int v3 = NFS_ISV3(dvp); + + nfsstats.rpccnt[NFSPROC_SYMLINK]++; + slen = strlen(ap->a_target); + mreq = nfsm_reqhead(dvp, NFSPROC_SYMLINK, NFSX_FH(v3) + 2*NFSX_UNSIGNED + + nfsm_rndup(cnp->cn_namelen) + nfsm_rndup(slen) + NFSX_SATTR(v3)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(dvp, v3); + nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); + if (v3) { + nfsm_v3attrbuild(vap, FALSE); + } + nfsm_strtom(ap->a_target, slen, NFS_MAXPATHLEN); + if (!v3) { + sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); + sp->sa_mode = vtonfsv2_mode(VLNK, vap->va_mode); + sp->sa_uid = nfs_xdrneg1; + sp->sa_gid = nfs_xdrneg1; + sp->sa_size = nfs_xdrneg1; + txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); + txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); + } + + /* + * Issue the NFS request and get the rpc response. + * + * Only NFSv3 responses returning an error of 0 actually return + * a file handle that can be converted into newvp without having + * to do an extra lookup rpc. + */ + nfsm_request(dvp, NFSPROC_SYMLINK, cnp->cn_thread, cnp->cn_cred); + if (v3) { + if (error == 0) + nfsm_mtofh(dvp, newvp, v3, gotvp); + nfsm_wcc_data(dvp, wccflag); + } + + /* + * out code jumps -> here, mrep is also freed. + */ + + m_freem(mrep); +nfsmout: + + /* + * If we do not have an error and we could not extract the newvp from + * the response due to the request being NFSv2, we have to do a + * lookup in order to obtain a newvp to return. + */ + if (error == 0 && newvp == NULL) { + struct nfsnode *np = NULL; + + error = nfs_lookitup(dvp, cnp->cn_nameptr, cnp->cn_namelen, + cnp->cn_cred, cnp->cn_thread, &np); + if (!error) + newvp = NFSTOV(np); + } + if (error) { + if (newvp) + vput(newvp); + } else { + *ap->a_vpp = newvp; + } + mtx_lock(&(VTONFS(dvp))->n_mtx); + VTONFS(dvp)->n_flag |= NMODIFIED; + mtx_unlock(&(VTONFS(dvp))->n_mtx); + if (!wccflag) { + VTONFS(dvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); + } + return (error); +} + +/* + * nfs make dir call + */ +static int +nfs_mkdir(struct vop_mkdir_args *ap) +{ + struct vnode *dvp = ap->a_dvp; + struct vattr *vap = ap->a_vap; + struct componentname *cnp = ap->a_cnp; + struct nfsv2_sattr *sp; + int len; + struct nfsnode *np = NULL; + struct vnode *newvp = NULL; + caddr_t bpos, dpos; + int error = 0, wccflag = NFSV3_WCCRATTR; + int gotvp = 0; + struct mbuf *mreq, *mrep, *md, *mb; + struct vattr vattr; + int v3 = NFS_ISV3(dvp); + + if ((error = VOP_GETATTR(dvp, &vattr, cnp->cn_cred)) != 0) + return (error); + len = cnp->cn_namelen; + nfsstats.rpccnt[NFSPROC_MKDIR]++; + mreq = nfsm_reqhead(dvp, NFSPROC_MKDIR, + NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len) + NFSX_SATTR(v3)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(dvp, v3); + nfsm_strtom(cnp->cn_nameptr, len, NFS_MAXNAMLEN); + if (v3) { + nfsm_v3attrbuild(vap, FALSE); + } else { + sp = nfsm_build(struct nfsv2_sattr *, NFSX_V2SATTR); + sp->sa_mode = vtonfsv2_mode(VDIR, vap->va_mode); + sp->sa_uid = nfs_xdrneg1; + sp->sa_gid = nfs_xdrneg1; + sp->sa_size = nfs_xdrneg1; + txdr_nfsv2time(&vap->va_atime, &sp->sa_atime); + txdr_nfsv2time(&vap->va_mtime, &sp->sa_mtime); + } + nfsm_request(dvp, NFSPROC_MKDIR, cnp->cn_thread, cnp->cn_cred); + if (!error) + nfsm_mtofh(dvp, newvp, v3, gotvp); + if (v3) + nfsm_wcc_data(dvp, wccflag); + m_freem(mrep); +nfsmout: + mtx_lock(&(VTONFS(dvp))->n_mtx); + VTONFS(dvp)->n_flag |= NMODIFIED; + mtx_unlock(&(VTONFS(dvp))->n_mtx); + if (!wccflag) { + VTONFS(dvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); + } + if (error == 0 && newvp == NULL) { + error = nfs_lookitup(dvp, cnp->cn_nameptr, len, cnp->cn_cred, + cnp->cn_thread, &np); + if (!error) { + newvp = NFSTOV(np); + if (newvp->v_type != VDIR) + error = EEXIST; + } + } + if (error) { + if (newvp) + vput(newvp); + } else + *ap->a_vpp = newvp; + return (error); +} + +/* + * nfs remove directory call + */ +static int +nfs_rmdir(struct vop_rmdir_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct vnode *dvp = ap->a_dvp; + struct componentname *cnp = ap->a_cnp; + caddr_t bpos, dpos; + int error = 0, wccflag = NFSV3_WCCRATTR; + struct mbuf *mreq, *mrep, *md, *mb; + int v3 = NFS_ISV3(dvp); + + if (dvp == vp) + return (EINVAL); + nfsstats.rpccnt[NFSPROC_RMDIR]++; + mreq = nfsm_reqhead(dvp, NFSPROC_RMDIR, + NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(cnp->cn_namelen)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(dvp, v3); + nfsm_strtom(cnp->cn_nameptr, cnp->cn_namelen, NFS_MAXNAMLEN); + nfsm_request(dvp, NFSPROC_RMDIR, cnp->cn_thread, cnp->cn_cred); + if (v3) + nfsm_wcc_data(dvp, wccflag); + m_freem(mrep); +nfsmout: + mtx_lock(&(VTONFS(dvp))->n_mtx); + VTONFS(dvp)->n_flag |= NMODIFIED; + mtx_unlock(&(VTONFS(dvp))->n_mtx); + if (!wccflag) { + VTONFS(dvp)->n_attrstamp = 0; + KDTRACE_NFS_ATTRCACHE_FLUSH_DONE(dvp); + } + cache_purge(dvp); + cache_purge(vp); + /* + * Kludge: Map ENOENT => 0 assuming that you have a reply to a retry. + */ + if (error == ENOENT) + error = 0; + return (error); +} + +/* + * nfs readdir call + */ +static int +nfs_readdir(struct vop_readdir_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct nfsnode *np = VTONFS(vp); + struct uio *uio = ap->a_uio; + int tresid, error = 0; + struct vattr vattr; + + if (vp->v_type != VDIR) + return(EPERM); + + /* + * First, check for hit on the EOF offset cache + */ + if (np->n_direofoffset > 0 && uio->uio_offset >= np->n_direofoffset && + (np->n_flag & NMODIFIED) == 0) { + if (VOP_GETATTR(vp, &vattr, ap->a_cred) == 0) { + mtx_lock(&np->n_mtx); + if (!NFS_TIMESPEC_COMPARE(&np->n_mtime, &vattr.va_mtime)) { + mtx_unlock(&np->n_mtx); + nfsstats.direofcache_hits++; + goto out; + } else + mtx_unlock(&np->n_mtx); + } + } + + /* + * Call nfs_bioread() to do the real work. + */ + tresid = uio->uio_resid; + error = nfs_bioread(vp, uio, 0, ap->a_cred); + + if (!error && uio->uio_resid == tresid) { + nfsstats.direofcache_misses++; + } +out: + return (error); +} + +/* + * Readdir rpc call. + * Called from below the buffer cache by nfs_doio(). + */ +int +nfs_readdirrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) +{ + int len, left; + struct dirent *dp = NULL; + u_int32_t *tl; + caddr_t cp; + nfsuint64 *cookiep; + caddr_t bpos, dpos; + struct mbuf *mreq, *mrep, *md, *mb; + nfsuint64 cookie; + struct nfsmount *nmp = VFSTONFS(vp->v_mount); + struct nfsnode *dnp = VTONFS(vp); + u_quad_t fileno; + int error = 0, tlen, more_dirs = 1, blksiz = 0, bigenough = 1; + int attrflag; + int v3 = NFS_ISV3(vp); + + KASSERT(uiop->uio_iovcnt == 1 && + (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && + (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, + ("nfs readdirrpc bad uio")); + + /* + * If there is no cookie, assume directory was stale. + */ + nfs_dircookie_lock(dnp); + cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); + if (cookiep) { + cookie = *cookiep; + nfs_dircookie_unlock(dnp); + } else { + nfs_dircookie_unlock(dnp); + return (NFSERR_BAD_COOKIE); + } + + /* + * Loop around doing readdir rpc's of size nm_readdirsize + * truncated to a multiple of DIRBLKSIZ. + * The stopping criteria is EOF or buffer full. + */ + while (more_dirs && bigenough) { + nfsstats.rpccnt[NFSPROC_READDIR]++; + mreq = nfsm_reqhead(vp, NFSPROC_READDIR, NFSX_FH(v3) + + NFSX_READDIR(v3)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, v3); + if (v3) { + tl = nfsm_build(u_int32_t *, 5 * NFSX_UNSIGNED); + *tl++ = cookie.nfsuquad[0]; + *tl++ = cookie.nfsuquad[1]; + mtx_lock(&dnp->n_mtx); + *tl++ = dnp->n_cookieverf.nfsuquad[0]; + *tl++ = dnp->n_cookieverf.nfsuquad[1]; + mtx_unlock(&dnp->n_mtx); + } else { + tl = nfsm_build(u_int32_t *, 2 * NFSX_UNSIGNED); + *tl++ = cookie.nfsuquad[0]; + } + *tl = txdr_unsigned(nmp->nm_readdirsize); + nfsm_request(vp, NFSPROC_READDIR, uiop->uio_td, cred); + if (v3) { + nfsm_postop_attr(vp, attrflag); + if (!error) { + tl = nfsm_dissect(u_int32_t *, + 2 * NFSX_UNSIGNED); + mtx_lock(&dnp->n_mtx); + dnp->n_cookieverf.nfsuquad[0] = *tl++; + dnp->n_cookieverf.nfsuquad[1] = *tl; + mtx_unlock(&dnp->n_mtx); + } else { + m_freem(mrep); + goto nfsmout; + } + } + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + more_dirs = fxdr_unsigned(int, *tl); + + /* loop thru the dir entries, doctoring them to 4bsd form */ + while (more_dirs && bigenough) { + if (v3) { + tl = nfsm_dissect(u_int32_t *, + 3 * NFSX_UNSIGNED); + fileno = fxdr_hyper(tl); + len = fxdr_unsigned(int, *(tl + 2)); + } else { + tl = nfsm_dissect(u_int32_t *, + 2 * NFSX_UNSIGNED); + fileno = fxdr_unsigned(u_quad_t, *tl++); + len = fxdr_unsigned(int, *tl); + } + if (len <= 0 || len > NFS_MAXNAMLEN) { + error = EBADRPC; + m_freem(mrep); + goto nfsmout; + } + tlen = nfsm_rndup(len); + if (tlen == len) + tlen += 4; /* To ensure null termination */ + left = DIRBLKSIZ - blksiz; + if ((tlen + DIRHDSIZ) > left) { + dp->d_reclen += left; + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base + left; + uiop->uio_iov->iov_len -= left; + uiop->uio_offset += left; + uiop->uio_resid -= left; + blksiz = 0; + } + if ((tlen + DIRHDSIZ) > uiop->uio_resid) + bigenough = 0; + if (bigenough) { + dp = (struct dirent *)uiop->uio_iov->iov_base; + dp->d_fileno = (int)fileno; + dp->d_namlen = len; + dp->d_reclen = tlen + DIRHDSIZ; + dp->d_type = DT_UNKNOWN; + blksiz += dp->d_reclen; + if (blksiz == DIRBLKSIZ) + blksiz = 0; + uiop->uio_offset += DIRHDSIZ; + uiop->uio_resid -= DIRHDSIZ; + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base + DIRHDSIZ; + uiop->uio_iov->iov_len -= DIRHDSIZ; + nfsm_mtouio(uiop, len); + cp = uiop->uio_iov->iov_base; + tlen -= len; + *cp = '\0'; /* null terminate */ + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base + tlen; + uiop->uio_iov->iov_len -= tlen; + uiop->uio_offset += tlen; + uiop->uio_resid -= tlen; + } else + nfsm_adv(nfsm_rndup(len)); + if (v3) { + tl = nfsm_dissect(u_int32_t *, + 3 * NFSX_UNSIGNED); + } else { + tl = nfsm_dissect(u_int32_t *, + 2 * NFSX_UNSIGNED); + } + if (bigenough) { + cookie.nfsuquad[0] = *tl++; + if (v3) + cookie.nfsuquad[1] = *tl++; + } else if (v3) + tl += 2; + else + tl++; + more_dirs = fxdr_unsigned(int, *tl); + } + /* + * If at end of rpc data, get the eof boolean + */ + if (!more_dirs) { + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + more_dirs = (fxdr_unsigned(int, *tl) == 0); + } + m_freem(mrep); + } + /* + * Fill last record, iff any, out to a multiple of DIRBLKSIZ + * by increasing d_reclen for the last record. + */ + if (blksiz > 0) { + left = DIRBLKSIZ - blksiz; + dp->d_reclen += left; + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base + left; + uiop->uio_iov->iov_len -= left; + uiop->uio_offset += left; + uiop->uio_resid -= left; + } + + /* + * We are now either at the end of the directory or have filled the + * block. + */ + if (bigenough) + dnp->n_direofoffset = uiop->uio_offset; + else { + if (uiop->uio_resid > 0) + nfs_printf("EEK! readdirrpc resid > 0\n"); + nfs_dircookie_lock(dnp); + cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); + *cookiep = cookie; + nfs_dircookie_unlock(dnp); + } +nfsmout: + return (error); +} + +/* + * NFS V3 readdir plus RPC. Used in place of nfs_readdirrpc(). + */ +int +nfs_readdirplusrpc(struct vnode *vp, struct uio *uiop, struct ucred *cred) +{ + int len, left; + struct dirent *dp; + u_int32_t *tl; + caddr_t cp; + struct vnode *newvp; + nfsuint64 *cookiep; + caddr_t bpos, dpos, dpossav1, dpossav2; + struct mbuf *mreq, *mrep, *md, *mb, *mdsav1, *mdsav2; + struct nameidata nami, *ndp = &nami; + struct componentname *cnp = &ndp->ni_cnd; + nfsuint64 cookie; + struct nfsmount *nmp = VFSTONFS(vp->v_mount); + struct nfsnode *dnp = VTONFS(vp), *np; + struct vattr vattr; + nfsfh_t *fhp; + u_quad_t fileno; + int error = 0, tlen, more_dirs = 1, blksiz = 0, doit, bigenough = 1, i; + int attrflag, fhsize; + +#ifndef nolint + dp = NULL; +#endif + KASSERT(uiop->uio_iovcnt == 1 && + (uiop->uio_offset & (DIRBLKSIZ - 1)) == 0 && + (uiop->uio_resid & (DIRBLKSIZ - 1)) == 0, + ("nfs readdirplusrpc bad uio")); + ndp->ni_dvp = vp; + newvp = NULLVP; + + /* + * If there is no cookie, assume directory was stale. + */ + nfs_dircookie_lock(dnp); + cookiep = nfs_getcookie(dnp, uiop->uio_offset, 0); + if (cookiep) { + cookie = *cookiep; + nfs_dircookie_unlock(dnp); + } else { + nfs_dircookie_unlock(dnp); + return (NFSERR_BAD_COOKIE); + } + /* + * Loop around doing readdir rpc's of size nm_readdirsize + * truncated to a multiple of DIRBLKSIZ. + * The stopping criteria is EOF or buffer full. + */ + while (more_dirs && bigenough) { + nfsstats.rpccnt[NFSPROC_READDIRPLUS]++; + mreq = nfsm_reqhead(vp, NFSPROC_READDIRPLUS, + NFSX_FH(1) + 6 * NFSX_UNSIGNED); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, 1); + tl = nfsm_build(u_int32_t *, 6 * NFSX_UNSIGNED); + *tl++ = cookie.nfsuquad[0]; + *tl++ = cookie.nfsuquad[1]; + mtx_lock(&dnp->n_mtx); + *tl++ = dnp->n_cookieverf.nfsuquad[0]; + *tl++ = dnp->n_cookieverf.nfsuquad[1]; + mtx_unlock(&dnp->n_mtx); + *tl++ = txdr_unsigned(nmp->nm_readdirsize); + *tl = txdr_unsigned(nmp->nm_rsize); + nfsm_request(vp, NFSPROC_READDIRPLUS, uiop->uio_td, cred); + nfsm_postop_attr(vp, attrflag); + if (error) { + m_freem(mrep); + goto nfsmout; + } + tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); + mtx_lock(&dnp->n_mtx); + dnp->n_cookieverf.nfsuquad[0] = *tl++; + dnp->n_cookieverf.nfsuquad[1] = *tl++; + mtx_unlock(&dnp->n_mtx); + more_dirs = fxdr_unsigned(int, *tl); + + /* loop thru the dir entries, doctoring them to 4bsd form */ + while (more_dirs && bigenough) { + tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); + fileno = fxdr_hyper(tl); + len = fxdr_unsigned(int, *(tl + 2)); + if (len <= 0 || len > NFS_MAXNAMLEN) { + error = EBADRPC; + m_freem(mrep); + goto nfsmout; + } + tlen = nfsm_rndup(len); + if (tlen == len) + tlen += 4; /* To ensure null termination*/ + left = DIRBLKSIZ - blksiz; + if ((tlen + DIRHDSIZ) > left) { + dp->d_reclen += left; + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base + left; + uiop->uio_iov->iov_len -= left; + uiop->uio_offset += left; + uiop->uio_resid -= left; + blksiz = 0; + } + if ((tlen + DIRHDSIZ) > uiop->uio_resid) + bigenough = 0; + if (bigenough) { + dp = (struct dirent *)uiop->uio_iov->iov_base; + dp->d_fileno = (int)fileno; + dp->d_namlen = len; + dp->d_reclen = tlen + DIRHDSIZ; + dp->d_type = DT_UNKNOWN; + blksiz += dp->d_reclen; + if (blksiz == DIRBLKSIZ) + blksiz = 0; + uiop->uio_offset += DIRHDSIZ; + uiop->uio_resid -= DIRHDSIZ; + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base + DIRHDSIZ; + uiop->uio_iov->iov_len -= DIRHDSIZ; + cnp->cn_nameptr = uiop->uio_iov->iov_base; + cnp->cn_namelen = len; + nfsm_mtouio(uiop, len); + cp = uiop->uio_iov->iov_base; + tlen -= len; + *cp = '\0'; + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base + tlen; + uiop->uio_iov->iov_len -= tlen; + uiop->uio_offset += tlen; + uiop->uio_resid -= tlen; + } else + nfsm_adv(nfsm_rndup(len)); + tl = nfsm_dissect(u_int32_t *, 3 * NFSX_UNSIGNED); + if (bigenough) { + cookie.nfsuquad[0] = *tl++; + cookie.nfsuquad[1] = *tl++; + } else + tl += 2; + + /* + * Since the attributes are before the file handle + * (sigh), we must skip over the attributes and then + * come back and get them. + */ + attrflag = fxdr_unsigned(int, *tl); + if (attrflag) { + dpossav1 = dpos; + mdsav1 = md; + nfsm_adv(NFSX_V3FATTR); + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + doit = fxdr_unsigned(int, *tl); + /* + * Skip loading the attrs for "..". There's a + * race between loading the attrs here and + * lookups that look for the directory currently + * being read (in the parent). We try to acquire + * the exclusive lock on ".." here, owning the + * lock on the directory being read. Lookup will + * hold the lock on ".." and try to acquire the + * lock on the directory being read. + * + * There are other ways of fixing this, one would + * be to do a trylock on the ".." vnode and skip + * loading the attrs on ".." if it happens to be + * locked by another process. But skipping the + * attrload on ".." seems the easiest option. + */ + if (strcmp(dp->d_name, "..") == 0) { + doit = 0; + /* + * We've already skipped over the attrs, + * skip over the filehandle. And store d_type + * as VDIR. + */ + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + i = fxdr_unsigned(int, *tl); + nfsm_adv(nfsm_rndup(i)); + dp->d_type = IFTODT(VTTOIF(VDIR)); + } + if (doit) { + nfsm_getfh(fhp, fhsize, 1); + if (NFS_CMPFH(dnp, fhp, fhsize)) { + VREF(vp); + newvp = vp; + np = dnp; + } else { + error = nfs_nget(vp->v_mount, fhp, + fhsize, &np, LK_EXCLUSIVE); + if (error) + doit = 0; + else + newvp = NFSTOV(np); + } + } + if (doit && bigenough) { + dpossav2 = dpos; + dpos = dpossav1; + mdsav2 = md; + md = mdsav1; + nfsm_loadattr(newvp, &vattr); + dpos = dpossav2; + md = mdsav2; + dp->d_type = IFTODT(VTTOIF(vattr.va_type)); + ndp->ni_vp = newvp; + cache_enter_time(ndp->ni_dvp, ndp->ni_vp, cnp, + &vattr.va_ctime); + } + } else { + /* Just skip over the file handle */ + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + i = fxdr_unsigned(int, *tl); + if (i) { + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + fhsize = fxdr_unsigned(int, *tl); + nfsm_adv(nfsm_rndup(fhsize)); + } + } + if (newvp != NULLVP) { + if (newvp == vp) + vrele(newvp); + else + vput(newvp); + newvp = NULLVP; + } + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + more_dirs = fxdr_unsigned(int, *tl); + } + /* + * If at end of rpc data, get the eof boolean + */ + if (!more_dirs) { + tl = nfsm_dissect(u_int32_t *, NFSX_UNSIGNED); + more_dirs = (fxdr_unsigned(int, *tl) == 0); + } + m_freem(mrep); + } + /* + * Fill last record, iff any, out to a multiple of DIRBLKSIZ + * by increasing d_reclen for the last record. + */ + if (blksiz > 0) { + left = DIRBLKSIZ - blksiz; + dp->d_reclen += left; + uiop->uio_iov->iov_base = + (char *)uiop->uio_iov->iov_base + left; + uiop->uio_iov->iov_len -= left; + uiop->uio_offset += left; + uiop->uio_resid -= left; + } + + /* + * We are now either at the end of the directory or have filled the + * block. + */ + if (bigenough) + dnp->n_direofoffset = uiop->uio_offset; + else { + if (uiop->uio_resid > 0) + nfs_printf("EEK! readdirplusrpc resid > 0\n"); + nfs_dircookie_lock(dnp); + cookiep = nfs_getcookie(dnp, uiop->uio_offset, 1); + *cookiep = cookie; + nfs_dircookie_unlock(dnp); + } +nfsmout: + if (newvp != NULLVP) { + if (newvp == vp) + vrele(newvp); + else + vput(newvp); + newvp = NULLVP; + } + return (error); +} + +/* + * Silly rename. To make the NFS filesystem that is stateless look a little + * more like the "ufs" a remove of an active vnode is translated to a rename + * to a funny looking filename that is removed by nfs_inactive on the + * nfsnode. There is the potential for another process on a different client + * to create the same funny name between the nfs_lookitup() fails and the + * nfs_rename() completes, but... + */ +static int +nfs_sillyrename(struct vnode *dvp, struct vnode *vp, struct componentname *cnp) +{ + struct sillyrename *sp; + struct nfsnode *np; + int error; + short pid; + unsigned int lticks; + + cache_purge(dvp); + np = VTONFS(vp); + KASSERT(vp->v_type != VDIR, ("nfs: sillyrename dir")); + sp = malloc(sizeof (struct sillyrename), + M_NFSREQ, M_WAITOK); + sp->s_cred = crhold(cnp->cn_cred); + sp->s_dvp = dvp; + sp->s_removeit = nfs_removeit; + VREF(dvp); + + /* + * Fudge together a funny name. + * Changing the format of the funny name to accomodate more + * sillynames per directory. + * The name is now changed to .nfs.<ticks>.<pid>.4, where ticks is + * CPU ticks since boot. + */ + pid = cnp->cn_thread->td_proc->p_pid; + lticks = (unsigned int)ticks; + for ( ; ; ) { + sp->s_namlen = sprintf(sp->s_name, + ".nfs.%08x.%04x4.4", lticks, + pid); + if (nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, + cnp->cn_thread, NULL)) + break; + lticks++; + } + error = nfs_renameit(dvp, cnp, sp); + if (error) + goto bad; + error = nfs_lookitup(dvp, sp->s_name, sp->s_namlen, sp->s_cred, + cnp->cn_thread, &np); + np->n_sillyrename = sp; + return (0); +bad: + vrele(sp->s_dvp); + crfree(sp->s_cred); + free((caddr_t)sp, M_NFSREQ); + return (error); +} + +/* + * Look up a file name and optionally either update the file handle or + * allocate an nfsnode, depending on the value of npp. + * npp == NULL --> just do the lookup + * *npp == NULL --> allocate a new nfsnode and make sure attributes are + * handled too + * *npp != NULL --> update the file handle in the vnode + */ +static int +nfs_lookitup(struct vnode *dvp, const char *name, int len, struct ucred *cred, + struct thread *td, struct nfsnode **npp) +{ + struct vnode *newvp = NULL; + struct nfsnode *np, *dnp = VTONFS(dvp); + caddr_t bpos, dpos; + int error = 0, fhlen, attrflag; + struct mbuf *mreq, *mrep, *md, *mb; + nfsfh_t *nfhp; + int v3 = NFS_ISV3(dvp); + + nfsstats.rpccnt[NFSPROC_LOOKUP]++; + mreq = nfsm_reqhead(dvp, NFSPROC_LOOKUP, + NFSX_FH(v3) + NFSX_UNSIGNED + nfsm_rndup(len)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(dvp, v3); + nfsm_strtom(name, len, NFS_MAXNAMLEN); + nfsm_request(dvp, NFSPROC_LOOKUP, td, cred); + if (npp && !error) { + nfsm_getfh(nfhp, fhlen, v3); + if (*npp) { + np = *npp; + if (np->n_fhsize > NFS_SMALLFH && fhlen <= NFS_SMALLFH) { + free((caddr_t)np->n_fhp, M_NFSBIGFH); + np->n_fhp = &np->n_fh; + } else if (np->n_fhsize <= NFS_SMALLFH && fhlen>NFS_SMALLFH) + np->n_fhp =(nfsfh_t *)malloc(fhlen, M_NFSBIGFH, M_WAITOK); + bcopy((caddr_t)nfhp, (caddr_t)np->n_fhp, fhlen); + np->n_fhsize = fhlen; + newvp = NFSTOV(np); + } else if (NFS_CMPFH(dnp, nfhp, fhlen)) { + VREF(dvp); + newvp = dvp; + } else { + error = nfs_nget(dvp->v_mount, nfhp, fhlen, &np, LK_EXCLUSIVE); + if (error) { + m_freem(mrep); + return (error); + } + newvp = NFSTOV(np); + } + if (v3) { + nfsm_postop_attr(newvp, attrflag); + if (!attrflag && *npp == NULL) { + m_freem(mrep); + if (newvp == dvp) + vrele(newvp); + else + vput(newvp); + return (ENOENT); + } + } else + nfsm_loadattr(newvp, NULL); + } + m_freem(mrep); +nfsmout: + if (npp && *npp == NULL) { + if (error) { + if (newvp) { + if (newvp == dvp) + vrele(newvp); + else + vput(newvp); + } + } else + *npp = np; + } + return (error); +} + +/* + * Nfs Version 3 commit rpc + */ +int +nfs_commit(struct vnode *vp, u_quad_t offset, int cnt, struct ucred *cred, + struct thread *td) +{ + u_int32_t *tl; + struct nfsmount *nmp = VFSTONFS(vp->v_mount); + caddr_t bpos, dpos; + int error = 0, wccflag = NFSV3_WCCRATTR; + struct mbuf *mreq, *mrep, *md, *mb; + + mtx_lock(&nmp->nm_mtx); + if ((nmp->nm_state & NFSSTA_HASWRITEVERF) == 0) { + mtx_unlock(&nmp->nm_mtx); + return (0); + } + mtx_unlock(&nmp->nm_mtx); + nfsstats.rpccnt[NFSPROC_COMMIT]++; + mreq = nfsm_reqhead(vp, NFSPROC_COMMIT, NFSX_FH(1)); + mb = mreq; + bpos = mtod(mb, caddr_t); + nfsm_fhtom(vp, 1); + tl = nfsm_build(u_int32_t *, 3 * NFSX_UNSIGNED); + txdr_hyper(offset, tl); + tl += 2; + *tl = txdr_unsigned(cnt); + nfsm_request(vp, NFSPROC_COMMIT, td, cred); + nfsm_wcc_data(vp, wccflag); + if (!error) { + tl = nfsm_dissect(u_int32_t *, NFSX_V3WRITEVERF); + if (bcmp((caddr_t)nmp->nm_verf, (caddr_t)tl, + NFSX_V3WRITEVERF)) { + bcopy((caddr_t)tl, (caddr_t)nmp->nm_verf, + NFSX_V3WRITEVERF); + error = NFSERR_STALEWRITEVERF; + } + } + m_freem(mrep); +nfsmout: + return (error); +} + +/* + * Strategy routine. + * For async requests when nfsiod(s) are running, queue the request by + * calling nfs_asyncio(), otherwise just all nfs_doio() to do the + * request. + */ +static int +nfs_strategy(struct vop_strategy_args *ap) +{ + struct buf *bp = ap->a_bp; + struct ucred *cr; + + KASSERT(!(bp->b_flags & B_DONE), + ("nfs_strategy: buffer %p unexpectedly marked B_DONE", bp)); + BUF_ASSERT_HELD(bp); + + if (bp->b_iocmd == BIO_READ) + cr = bp->b_rcred; + else + cr = bp->b_wcred; + + /* + * If the op is asynchronous and an i/o daemon is waiting + * queue the request, wake it up and wait for completion + * otherwise just do it ourselves. + */ + if ((bp->b_flags & B_ASYNC) == 0 || + nfs_asyncio(VFSTONFS(ap->a_vp->v_mount), bp, NOCRED, curthread)) + (void)nfs_doio(ap->a_vp, bp, cr, curthread); + return (0); +} + +/* + * fsync vnode op. Just call nfs_flush() with commit == 1. + */ +/* ARGSUSED */ +static int +nfs_fsync(struct vop_fsync_args *ap) +{ + + return (nfs_flush(ap->a_vp, ap->a_waitfor, 1)); +} + +/* + * Flush all the blocks associated with a vnode. + * Walk through the buffer pool and push any dirty pages + * associated with the vnode. + */ +static int +nfs_flush(struct vnode *vp, int waitfor, int commit) +{ + struct nfsnode *np = VTONFS(vp); + struct buf *bp; + int i; + struct buf *nbp; + struct nfsmount *nmp = VFSTONFS(vp->v_mount); + int error = 0, slptimeo = 0, slpflag = 0, retv, bvecpos; + int passone = 1; + u_quad_t off, endoff, toff; + struct ucred* wcred = NULL; + struct buf **bvec = NULL; + struct bufobj *bo; + struct thread *td = curthread; +#ifndef NFS_COMMITBVECSIZ +#define NFS_COMMITBVECSIZ 20 +#endif + struct buf *bvec_on_stack[NFS_COMMITBVECSIZ]; + int bvecsize = 0, bveccount; + + if (nmp->nm_flag & NFSMNT_INT) + slpflag = NFS_PCATCH; + if (!commit) + passone = 0; + bo = &vp->v_bufobj; + /* + * A b_flags == (B_DELWRI | B_NEEDCOMMIT) block has been written to the + * server, but has not been committed to stable storage on the server + * yet. On the first pass, the byte range is worked out and the commit + * rpc is done. On the second pass, nfs_writebp() is called to do the + * job. + */ +again: + off = (u_quad_t)-1; + endoff = 0; + bvecpos = 0; + if (NFS_ISV3(vp) && commit) { + if (bvec != NULL && bvec != bvec_on_stack) + free(bvec, M_TEMP); + /* + * Count up how many buffers waiting for a commit. + */ + bveccount = 0; + BO_LOCK(bo); + TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { + if (!BUF_ISLOCKED(bp) && + (bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) + == (B_DELWRI | B_NEEDCOMMIT)) + bveccount++; + } + /* + * Allocate space to remember the list of bufs to commit. It is + * important to use M_NOWAIT here to avoid a race with nfs_write. + * If we can't get memory (for whatever reason), we will end up + * committing the buffers one-by-one in the loop below. + */ + if (bveccount > NFS_COMMITBVECSIZ) { + /* + * Release the vnode interlock to avoid a lock + * order reversal. + */ + BO_UNLOCK(bo); + bvec = (struct buf **) + malloc(bveccount * sizeof(struct buf *), + M_TEMP, M_NOWAIT); + BO_LOCK(bo); + if (bvec == NULL) { + bvec = bvec_on_stack; + bvecsize = NFS_COMMITBVECSIZ; + } else + bvecsize = bveccount; + } else { + bvec = bvec_on_stack; + bvecsize = NFS_COMMITBVECSIZ; + } + TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { + if (bvecpos >= bvecsize) + break; + if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { + nbp = TAILQ_NEXT(bp, b_bobufs); + continue; + } + if ((bp->b_flags & (B_DELWRI | B_NEEDCOMMIT)) != + (B_DELWRI | B_NEEDCOMMIT)) { + BUF_UNLOCK(bp); + nbp = TAILQ_NEXT(bp, b_bobufs); + continue; + } + BO_UNLOCK(bo); + bremfree(bp); + /* + * Work out if all buffers are using the same cred + * so we can deal with them all with one commit. + * + * NOTE: we are not clearing B_DONE here, so we have + * to do it later on in this routine if we intend to + * initiate I/O on the bp. + * + * Note: to avoid loopback deadlocks, we do not + * assign b_runningbufspace. + */ + if (wcred == NULL) + wcred = bp->b_wcred; + else if (wcred != bp->b_wcred) + wcred = NOCRED; + vfs_busy_pages(bp, 1); + + BO_LOCK(bo); + /* + * bp is protected by being locked, but nbp is not + * and vfs_busy_pages() may sleep. We have to + * recalculate nbp. + */ + nbp = TAILQ_NEXT(bp, b_bobufs); + + /* + * A list of these buffers is kept so that the + * second loop knows which buffers have actually + * been committed. This is necessary, since there + * may be a race between the commit rpc and new + * uncommitted writes on the file. + */ + bvec[bvecpos++] = bp; + toff = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + + bp->b_dirtyoff; + if (toff < off) + off = toff; + toff += (u_quad_t)(bp->b_dirtyend - bp->b_dirtyoff); + if (toff > endoff) + endoff = toff; + } + BO_UNLOCK(bo); + } + if (bvecpos > 0) { + /* + * Commit data on the server, as required. + * If all bufs are using the same wcred, then use that with + * one call for all of them, otherwise commit each one + * separately. + */ + if (wcred != NOCRED) + retv = nfs_commit(vp, off, (int)(endoff - off), + wcred, td); + else { + retv = 0; + for (i = 0; i < bvecpos; i++) { + off_t off, size; + bp = bvec[i]; + off = ((u_quad_t)bp->b_blkno) * DEV_BSIZE + + bp->b_dirtyoff; + size = (u_quad_t)(bp->b_dirtyend + - bp->b_dirtyoff); + retv = nfs_commit(vp, off, (int)size, + bp->b_wcred, td); + if (retv) break; + } + } + + if (retv == NFSERR_STALEWRITEVERF) + nfs_clearcommit(vp->v_mount); + + /* + * Now, either mark the blocks I/O done or mark the + * blocks dirty, depending on whether the commit + * succeeded. + */ + for (i = 0; i < bvecpos; i++) { + bp = bvec[i]; + bp->b_flags &= ~(B_NEEDCOMMIT | B_CLUSTEROK); + if (retv) { + /* + * Error, leave B_DELWRI intact + */ + vfs_unbusy_pages(bp); + brelse(bp); + } else { + /* + * Success, remove B_DELWRI ( bundirty() ). + * + * b_dirtyoff/b_dirtyend seem to be NFS + * specific. We should probably move that + * into bundirty(). XXX + */ + bufobj_wref(bo); + bp->b_flags |= B_ASYNC; + bundirty(bp); + bp->b_flags &= ~B_DONE; + bp->b_ioflags &= ~BIO_ERROR; + bp->b_dirtyoff = bp->b_dirtyend = 0; + bufdone(bp); + } + } + } + + /* + * Start/do any write(s) that are required. + */ +loop: + BO_LOCK(bo); + TAILQ_FOREACH_SAFE(bp, &bo->bo_dirty.bv_hd, b_bobufs, nbp) { + if (BUF_LOCK(bp, LK_EXCLUSIVE | LK_NOWAIT, NULL)) { + if (waitfor != MNT_WAIT || passone) + continue; + + error = BUF_TIMELOCK(bp, + LK_EXCLUSIVE | LK_SLEEPFAIL | LK_INTERLOCK, + BO_MTX(bo), "nfsfsync", slpflag, slptimeo); + if (error == 0) { + BUF_UNLOCK(bp); + goto loop; + } + if (error == ENOLCK) { + error = 0; + goto loop; + } + if (nfs_sigintr(nmp, td)) { + error = EINTR; + goto done; + } + if (slpflag & PCATCH) { + slpflag = 0; + slptimeo = 2 * hz; + } + goto loop; + } + if ((bp->b_flags & B_DELWRI) == 0) + panic("nfs_fsync: not dirty"); + if ((passone || !commit) && (bp->b_flags & B_NEEDCOMMIT)) { + BUF_UNLOCK(bp); + continue; + } + BO_UNLOCK(bo); + bremfree(bp); + if (passone || !commit) + bp->b_flags |= B_ASYNC; + else + bp->b_flags |= B_ASYNC; + bwrite(bp); + if (nfs_sigintr(nmp, td)) { + error = EINTR; + goto done; + } + goto loop; + } + if (passone) { + passone = 0; + BO_UNLOCK(bo); + goto again; + } + if (waitfor == MNT_WAIT) { + while (bo->bo_numoutput) { + error = bufobj_wwait(bo, slpflag, slptimeo); + if (error) { + BO_UNLOCK(bo); + error = nfs_sigintr(nmp, td); + if (error) + goto done; + if (slpflag & PCATCH) { + slpflag = 0; + slptimeo = 2 * hz; + } + BO_LOCK(bo); + } + } + if (bo->bo_dirty.bv_cnt != 0 && commit) { + BO_UNLOCK(bo); + goto loop; + } + /* + * Wait for all the async IO requests to drain + */ + BO_UNLOCK(bo); + mtx_lock(&np->n_mtx); + while (np->n_directio_asyncwr > 0) { + np->n_flag |= NFSYNCWAIT; + error = nfs_msleep(td, (caddr_t)&np->n_directio_asyncwr, + &np->n_mtx, slpflag | (PRIBIO + 1), + "nfsfsync", 0); + if (error) { + if (nfs_sigintr(nmp, td)) { + mtx_unlock(&np->n_mtx); + error = EINTR; + goto done; + } + } + } + mtx_unlock(&np->n_mtx); + } else + BO_UNLOCK(bo); + mtx_lock(&np->n_mtx); + if (np->n_flag & NWRITEERR) { + error = np->n_error; + np->n_flag &= ~NWRITEERR; + } + if (commit && bo->bo_dirty.bv_cnt == 0 && + bo->bo_numoutput == 0 && np->n_directio_asyncwr == 0) + np->n_flag &= ~NMODIFIED; + mtx_unlock(&np->n_mtx); +done: + if (bvec != NULL && bvec != bvec_on_stack) + free(bvec, M_TEMP); + return (error); +} + +/* + * NFS advisory byte-level locks. + */ +static int +nfs_advlock(struct vop_advlock_args *ap) +{ + struct vnode *vp = ap->a_vp; + u_quad_t size; + int error; + + error = vn_lock(vp, LK_SHARED); + if (error) + return (error); + if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { + size = VTONFS(vp)->n_size; + VOP_UNLOCK(vp, 0); + error = lf_advlock(ap, &(vp->v_lockf), size); + } else { + if (nfs_advlock_p) + error = nfs_advlock_p(ap); + else + error = ENOLCK; + } + + return (error); +} + +/* + * NFS advisory byte-level locks. + */ +static int +nfs_advlockasync(struct vop_advlockasync_args *ap) +{ + struct vnode *vp = ap->a_vp; + u_quad_t size; + int error; + + error = vn_lock(vp, LK_SHARED); + if (error) + return (error); + if ((VFSTONFS(vp->v_mount)->nm_flag & NFSMNT_NOLOCKD) != 0) { + size = VTONFS(vp)->n_size; + VOP_UNLOCK(vp, 0); + error = lf_advlockasync(ap, &(vp->v_lockf), size); + } else { + VOP_UNLOCK(vp, 0); + error = EOPNOTSUPP; + } + return (error); +} + +/* + * Print out the contents of an nfsnode. + */ +static int +nfs_print(struct vop_print_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct nfsnode *np = VTONFS(vp); + + nfs_printf("\tfileid %ld fsid 0x%x", + np->n_vattr.va_fileid, np->n_vattr.va_fsid); + if (vp->v_type == VFIFO) + fifo_printinfo(vp); + printf("\n"); + return (0); +} + +/* + * This is the "real" nfs::bwrite(struct buf*). + * We set B_CACHE if this is a VMIO buffer. + */ +int +nfs_writebp(struct buf *bp, int force __unused, struct thread *td) +{ + int s; + int oldflags = bp->b_flags; +#if 0 + int retv = 1; + off_t off; +#endif + + BUF_ASSERT_HELD(bp); + + if (bp->b_flags & B_INVAL) { + brelse(bp); + return(0); + } + + bp->b_flags |= B_CACHE; + + /* + * Undirty the bp. We will redirty it later if the I/O fails. + */ + + s = splbio(); + bundirty(bp); + bp->b_flags &= ~B_DONE; + bp->b_ioflags &= ~BIO_ERROR; + bp->b_iocmd = BIO_WRITE; + + bufobj_wref(bp->b_bufobj); + curthread->td_ru.ru_oublock++; + splx(s); + + /* + * Note: to avoid loopback deadlocks, we do not + * assign b_runningbufspace. + */ + vfs_busy_pages(bp, 1); + + BUF_KERNPROC(bp); + bp->b_iooffset = dbtob(bp->b_blkno); + bstrategy(bp); + + if( (oldflags & B_ASYNC) == 0) { + int rtval = bufwait(bp); + + if (oldflags & B_DELWRI) { + s = splbio(); + reassignbuf(bp); + splx(s); + } + brelse(bp); + return (rtval); + } + + return (0); +} + +/* + * nfs special file access vnode op. + * Essentially just get vattr and then imitate iaccess() since the device is + * local to the client. + */ +static int +nfsspec_access(struct vop_access_args *ap) +{ + struct vattr *vap; + struct ucred *cred = ap->a_cred; + struct vnode *vp = ap->a_vp; + accmode_t accmode = ap->a_accmode; + struct vattr vattr; + int error; + + /* + * Disallow write attempts on filesystems mounted read-only; + * unless the file is a socket, fifo, or a block or character + * device resident on the filesystem. + */ + if ((accmode & VWRITE) && (vp->v_mount->mnt_flag & MNT_RDONLY)) { + switch (vp->v_type) { + case VREG: + case VDIR: + case VLNK: + return (EROFS); + default: + break; + } + } + vap = &vattr; + error = VOP_GETATTR(vp, vap, cred); + if (error) + goto out; + error = vaccess(vp->v_type, vap->va_mode, vap->va_uid, vap->va_gid, + accmode, cred, NULL); +out: + return error; +} + +/* + * Read wrapper for fifos. + */ +static int +nfsfifo_read(struct vop_read_args *ap) +{ + struct nfsnode *np = VTONFS(ap->a_vp); + int error; + + /* + * Set access flag. + */ + mtx_lock(&np->n_mtx); + np->n_flag |= NACC; + getnanotime(&np->n_atim); + mtx_unlock(&np->n_mtx); + error = fifo_specops.vop_read(ap); + return error; +} + +/* + * Write wrapper for fifos. + */ +static int +nfsfifo_write(struct vop_write_args *ap) +{ + struct nfsnode *np = VTONFS(ap->a_vp); + + /* + * Set update flag. + */ + mtx_lock(&np->n_mtx); + np->n_flag |= NUPD; + getnanotime(&np->n_mtim); + mtx_unlock(&np->n_mtx); + return(fifo_specops.vop_write(ap)); +} + +/* + * Close wrapper for fifos. + * + * Update the times on the nfsnode then do fifo close. + */ +static int +nfsfifo_close(struct vop_close_args *ap) +{ + struct vnode *vp = ap->a_vp; + struct nfsnode *np = VTONFS(vp); + struct vattr vattr; + struct timespec ts; + + mtx_lock(&np->n_mtx); + if (np->n_flag & (NACC | NUPD)) { + getnanotime(&ts); + if (np->n_flag & NACC) + np->n_atim = ts; + if (np->n_flag & NUPD) + np->n_mtim = ts; + np->n_flag |= NCHG; + if (vrefcnt(vp) == 1 && + (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { + VATTR_NULL(&vattr); + if (np->n_flag & NACC) + vattr.va_atime = np->n_atim; + if (np->n_flag & NUPD) + vattr.va_mtime = np->n_mtim; + mtx_unlock(&np->n_mtx); + (void)VOP_SETATTR(vp, &vattr, ap->a_cred); + goto out; + } + } + mtx_unlock(&np->n_mtx); +out: + return (fifo_specops.vop_close(ap)); +} + +/* + * Just call nfs_writebp() with the force argument set to 1. + * + * NOTE: B_DONE may or may not be set in a_bp on call. + */ +static int +nfs_bwrite(struct buf *bp) +{ + + return (nfs_writebp(bp, 1, curthread)); +} + +struct buf_ops buf_ops_nfs = { + .bop_name = "buf_ops_nfs", + .bop_write = nfs_bwrite, + .bop_strategy = bufstrategy, + .bop_sync = bufsync, + .bop_bdflush = bufbdflush, +}; |
